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Two-step liquid-phase synthesis of argyrodite Li6PS5Cl solid electrolyte using nonionic surfactant
Síntesis en fase líquida en 2 pasos del electrolito sólido de argirodita Li6PS5Cl utilizando un surfactante no iónico
Nataly Carolina Rosero-Navarroa,
Corresponding author
rosero@eng.hokudai.ac.jp

Corresponding author.
, Hazuki Niwab, Akira Miuraa, Kiyoharu Tadanagaa
a Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
b Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan
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Recently&#44; the liquid phase syntheses <a class="elsevierStyleCrossRefs" href="#bib0230">&#91;3&#44;4&#93;</a> have attracted much attention as a versatile chemical route to prepare sulfide solid electrolytes since this is considered more practical from a mass-produce point of view through reducing processing time and thermal treatments&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">According to the literatures <a class="elsevierStyleCrossRefs" href="#bib0230">&#91;3&#8211;5&#93;</a>&#44; there are so far two differentiated routes to prepare sulfide solid electrolyte by liquid-phase synthesis&#58; &#40;i&#41; dissolution-precipitation of sulfide solid electrolyte precursor&#44; previously obtained by mechanical milling or solid-state reactions <a class="elsevierStyleCrossRefs" href="#bib0245">&#91;6&#8211;16&#93;</a> and&#44; &#40;ii&#41; suspension-reaction of the precursors without any previous mechanochemical reaction <a class="elsevierStyleCrossRefs" href="#bib0300">&#91;17&#8211;27&#93;</a>&#46; Solvents such as hydrazine&#44; N-methylformamide&#44; and ethanol are used to dissolve the sulfide electrolytes&#46; In the suspension-reaction process&#44; the precursors &#40;Li<span class="elsevierStyleInf">2</span>S&#44; P<span class="elsevierStyleInf">2</span>S<span class="elsevierStyleInf">5</span>&#44; LiI&#44; etc&#46;&#41;&#44; without previous reaction&#44; are dispersed into a solvent such as acetonitrile&#44; tetrahydrofuran or 1&#44;2-dimethoxyethane&#46; The reactions are promoted by the stirring process or accelerated by shaking <a class="elsevierStyleCrossRefs" href="#bib0320">&#91;21&#44;25&#93;</a> &#40;using zirconia balls&#41; or ultrasonic irradiation <a class="elsevierStyleCrossRefs" href="#bib0335">&#91;24&#44;26&#93;</a> processes&#46; In both cases&#44; the solvents are removed at temperatures above 100<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; A combined approach &#40;two-step liquid-phase synthesis&#41; using suspension-reaction and dissolution-precipitation has also been explored to prepare sulfide solid electrolytes <a class="elsevierStyleCrossRefs" href="#bib0355">&#91;28&#8211;30&#93;</a>&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">From the point of view of the application in all-solid-state batteries&#44; a liquid-phase synthesis that involves the dissolution of the sulfide electrolyte is more advantaged&#46; For instance&#44; the precipitation of the sulfide electrolyte&#44; crucial for compaction of the material&#44; could be controlled by selecting the solvents&#44; evaporation rate&#44; or the use of surfactants&#46; Furthermore&#44; the use of a precursor solution of sulfide solid electrolyte is also especially favorable for the preparation of composite electrodes since it can effectively cover the solids particles of active material&#44; improving the percolation of the sulfide solid electrolyte &#40;lithium pathway&#41; through them&#46; Therefore&#44; a low interfacial electrode&#8211;electrolyte resistance is fabricated&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Among sulfide electrolytes&#44; argyrodite-type Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>X &#40;X<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>Cl&#44; Br&#41; solid electrolytes are attractive materials formed by PS<span class="elsevierStyleInf">4</span><span class="elsevierStyleSup">3&#8722;</span>&#44; S<span class="elsevierStyleSup">2&#8722;</span>&#44; X<span class="elsevierStyleSup">&#8722;</span> and Li<span class="elsevierStyleSup">&#43;</span> ions <a class="elsevierStyleCrossRefs" href="#bib0360">&#91;29&#44;31&#93;</a>&#46; Their preparation by two-step liquid-phase synthesis has been reported <a class="elsevierStyleCrossRefs" href="#bib0355">&#91;28&#8211;30&#93;</a>&#44; following the next reactions&#58;<elsevierMultimedia ident="eq0005"></elsevierMultimedia></p><p id="par0025" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">suspension-reaction using tetrahydrofuran &#40;THF&#41; or ethyl propionate &#40;EP&#41;</span><elsevierMultimedia ident="eq0010"></elsevierMultimedia></p><p id="par0030" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">dissolution-precipitation using ethanol</span></p><p id="par0035" class="elsevierStylePara elsevierViewall">The ionic conductivity of the argyrodite electrolytes by this two-step liquid phase process varies in almost one order of magnitude depending on the solvent medium&#44; achieving 1&#46;3<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;4</span> and 3&#46;4<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;5</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> for the THF-ethanol and EP-ethanol system&#44; respectively <a class="elsevierStyleCrossRefs" href="#bib0355">&#91;28&#44;29&#93;</a>&#46; In the present work&#44; argyrodite Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl sulfide solid electrolyte is prepared by a two-step liquid phase process using a different solvent medium&#44; acetonitrile for suspension-reaction and ethanol&#47;acetonitrile for dissolution-precipitation&#44; respectively&#46; The effect of nonionic surfactant on the properties of the argyrodite electrolyte is also studied&#46; A nonionic surfactant such as Triton X-100 &#40;C<span class="elsevierStyleInf">14</span>H<span class="elsevierStyleInf">22</span>O&#40;C<span class="elsevierStyleInf">2</span>H<span class="elsevierStyleInf">4</span>O&#41;<span class="elsevierStyleInf">8</span>&#44; t-octylphenoxypolyethoxy-ethanol&#41; is expected to be less reactive to the sulfide electrolyte precursor and prevent side reactions while the morphology can be controlled&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Experimental</span><p id="par0040" class="elsevierStylePara elsevierViewall">The solid electrolytes were prepared in a glove box under an argon atmosphere&#46; The characterizations were also carried out under an inert atmosphere using adequate transfer holders to prevent undesired reactions with moisture&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>a illustrates the synthesis procedure of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte by liquid phase process using a suspension-reaction process followed by a dissolution-precipitation process&#46; Typically&#44; 0&#46;5<span class="elsevierStyleHsp" style=""></span>g of stoichiometric proportions of Li<span class="elsevierStyleInf">2</span>S &#40;Mitsuwa&#39;s Purity Chemicals&#44; 99&#46;9&#37;&#41;&#44; P<span class="elsevierStyleInf">2</span>S<span class="elsevierStyleInf">5</span> &#40;Sigma&#8211;Aldrich&#44; 99&#37;&#41;&#44; and LiCl &#40;Sigma&#8211;Aldrich&#44; 99&#46;9&#37;&#41; were mixed in an agate mortar for 5<span class="elsevierStyleHsp" style=""></span>minutes&#46; The mixed powder was transferred to a glass vessel with 10<span class="elsevierStyleHsp" style=""></span>mL of acetonitrile &#40;99&#46;5&#37;&#44; Wako Pure Chemical&#44; Japan&#41;&#46; The mixture was ultrasonicated for 60<span class="elsevierStyleHsp" style=""></span>min at 60<span class="elsevierStyleHsp" style=""></span>&#176;C under 45<span class="elsevierStyleHsp" style=""></span>kHz using an ultrasonic bath &#40;Shimadzu SUS-103&#41;&#46; The reaction was verified by the formation of a white suspension&#46; Then&#44; 15<span class="elsevierStyleHsp" style=""></span>mL ethanol &#40;99&#46;5&#37;&#44; Wako Pure Chemical&#44; Japan&#41; and 15<span class="elsevierStyleHsp" style=""></span>mL acetonitrile were added to obtain a yellowish transparent solution &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>a&#41;&#46; Note that ethanol is mostly used to dissolve the sulfide electrolyte while acetonitrile can partially contribute to the dissolution <a class="elsevierStyleCrossRef" href="#bib0375">&#91;32&#93;</a>&#46; The effect of the surfactant was studied through the addition of 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; of Triton X-100 to Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl-solution&#46; Triton X-100 is a nonionic surfactant which has a hydrophilic polyethylene oxide chain and an aromatic hydrophobic group&#46; The solid electrolyte solution was dried at and 180<span class="elsevierStyleHsp" style=""></span>&#176;C for 4<span class="elsevierStyleHsp" style=""></span>h under vacuum to remove the solvent and obtain solid powders&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0050" class="elsevierStylePara elsevierViewall">Crystal phase&#44; morphology&#44; and electrochemical properties of the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte were examined to elucidate the effect of the solvent medium including the surfactant on the properties of the sulfide solid electrolyte obtained by the two-step liquid phase process&#46; Crystal phase evaluated by X-ray diffraction &#40;XRD&#41; was carried out with an X-ray diffractometer &#40;MultiFlex600&#44; Rigaku&#41; using CuK&#945; radiation &#40;1&#46;5418<span class="elsevierStyleHsp" style=""></span>&#8491;&#41; in the 2<span class="elsevierStyleItalic">&#952;</span> scan range of 20&#8211;40&#176;&#46; XRD analysis by SmartLab Studio II software&#46; Morphology was observed by scanning electron microscopy &#40;SEM&#41;&#44; performed on a JIB-4600F Multibeam SEM-FIB Scanning Electron Microscope&#46; Electrochemical properties of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte were evaluated by electrochemical impedance spectroscopy &#40;EIS&#41; and cyclic voltammetry &#40;CV&#41; techniques&#46; EIS was carried out using impedance analyzer &#40;SI 1260&#44; Solartron&#41; in a frequency range of 1 and 1<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">6</span> Hz at temperatures between 22<span class="elsevierStyleHsp" style=""></span>&#176;C and 84<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; The solid electrolyte powder &#40;80<span class="elsevierStyleHsp" style=""></span>mg&#41; was pressed under 360<span class="elsevierStyleHsp" style=""></span>MPa &#40;at room temperature&#41; in a polycarbonate tube 10<span class="elsevierStyleHsp" style=""></span>mm in diameter&#46; Two stainless steel &#40;SS&#41; disks were used as current collectors&#46; The ohmic total resistance &#40;Rt&#41; was normalized to the pellet geometry&#44; thickness &#40;<span class="elsevierStyleItalic">t</span>&#41; and surface area &#40;<span class="elsevierStyleItalic">A</span>&#41;&#44; to calculate the conductivity through the formula <span class="elsevierStyleItalic">&#963;</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">t</span>&#47;Rt&#183;<span class="elsevierStyleItalic">A</span>&#46; The geometric density of pellets was calculated from the weight and geometric dimensions&#46; For the CV measurements&#44; a potentiostat&#47;galvanostat device &#40;SI 1287&#44; Solartron&#41; was used in the potential range of &#8722;0&#46;5<span class="elsevierStyleHsp" style=""></span>V to 5<span class="elsevierStyleHsp" style=""></span>V &#40;vs&#46; Li&#47;Li&#43;&#41; at a scanning rate of 1<span class="elsevierStyleHsp" style=""></span>mV<span class="elsevierStyleHsp" style=""></span>s<span class="elsevierStyleSup">&#8722;1</span>&#46; Li&#8211;In alloy foil was attached to one of the pellet faces and two SS disks were used as current collectors&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Results and discussion</span><p id="par0055" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>a shows the X-ray diffraction &#40;XRD&#41; patterns of powder samples obtained by the two-step liquid phase process without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#46; The indexed XRD pattern of the Li<span class="elsevierStyleInf">6&#46;2</span>PS<span class="elsevierStyleInf">5</span>Cl &#40;ICDD &#35;418490&#41; phase was included for comparison&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0060" class="elsevierStylePara elsevierViewall">The argyrodite phase was obtained after the two-step liquid phase process&#44; verifying that a short reaction time of 60<span class="elsevierStyleHsp" style=""></span>min &#40;under ultrasonication&#41; is enough to promote the reaction of Li<span class="elsevierStyleInf">2</span>S&#44; P<span class="elsevierStyleInf">2</span>S<span class="elsevierStyleInf">5</span>&#44; &#40;Li<span class="elsevierStyleInf">3</span>PS<span class="elsevierStyleInf">4</span>&#41; and LiCl precursors <a class="elsevierStyleCrossRef" href="#bib0355">&#91;28&#93;</a>&#46; The small peaks centered at &#8764;27&#176; and &#8764;35&#176; corresponding to Li<span class="elsevierStyleInf">2</span>S and LiCl were also observed&#46; The XRD powder patterns were indexed as a cubic cell with lattice parameters of 9&#46;856&#40;9&#41; and 9&#46;853&#40;2&#41; &#8491; for the solid electrolyte obtained by the liquid phase process without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#44; respectively&#46; Lattice parameters coincide with those given in the literature &#40;ICSD&#35;418490&#58; 9&#46;850&#40;4&#41; &#8491;&#41;&#46; The slightly larger lattice is related to the plausible formation of sub-stoichiometry chlorine phases &#40;Li<span class="elsevierStyleInf">7&#8722;<span class="elsevierStyleItalic">x</span></span>PS<span class="elsevierStyleInf">6&#8722;<span class="elsevierStyleItalic">x</span></span>Cl<span class="elsevierStyleInf"><span class="elsevierStyleItalic">x</span></span>&#41; <a class="elsevierStyleCrossRef" href="#bib0380">&#91;33&#93;</a>&#46; The presence of the surfactant does not show significant changes in the XRD patterns&#46; On the other hand&#44; the full width at half maximum &#40;FWHM&#41; values of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl with surfactant were larger than Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl without surfactant&#46; For reference&#44; from the intense peak on plane &#40;220&#41; at 2<span class="elsevierStyleItalic">&#952;</span> of 25&#46;5&#176;&#44; FMHW is 0&#46;279&#176; and 0&#46;2944&#176; for Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#44; respectively&#46; This suggests that the average crystallite size <a class="elsevierStyleCrossRef" href="#bib0385">&#91;34&#93;</a> should be smaller in the case of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>b displays a Raman spectrum of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte obtained by liquid phase process with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#46; Bands located at 266<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span>&#44; 424<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1&#44;</span> and 580<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> are associated with PS<span class="elsevierStyleInf">4</span><span class="elsevierStyleSup">3&#8722;</span> units&#44; which are structural units of argyrodite structure&#46; Moreover&#44; the absence of bands associated with the solvents or surfactant&#44; such as vibrational mode of skeletal C<span class="elsevierStyleGlyphsbnd"></span>C<span class="elsevierStyleGlyphsbnd"></span>O stretching at &#8764;884<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> from ethanol <a class="elsevierStyleCrossRef" href="#bib0260">&#91;9&#93;</a> or vibrational mode of C<span class="elsevierStyleGlyphsbnd"></span>C<span class="elsevierStyleGlyphlbond2"></span>N bending at &#8764;370<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> from acetonitrile <a class="elsevierStyleCrossRef" href="#bib0335">&#91;24&#93;</a>&#44; verified their major removal after heat treatment at low temperatures of 180<span class="elsevierStyleHsp" style=""></span>&#176;C and negligible effect of the addition of the surfactant on the argyrodite structure&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a> shows the morphology of the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte obtained by liquid phase process without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0075" class="elsevierStylePara elsevierViewall">Irregular particles with different sizes were observed in the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte powder derived from the solution without the surfactant&#46; The particle size varies from big particles or agglomerates up to 2&#8211;5<span class="elsevierStyleHsp" style=""></span>&#956;m &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>a&#41; and small particle sizes of lower than 500<span class="elsevierStyleHsp" style=""></span>nm &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>c&#41;&#46; The small particles &#40;&#60;500<span class="elsevierStyleHsp" style=""></span>nm&#41; were also observed in the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte powder derived from the solution containing the surfactant &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>d&#41;&#46; However&#44; big particles or agglomerates were not observed &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>b&#41;&#46; Contrarily&#44; particles with regular distribution with <span class="elsevierStyleItalic">quasi</span> spherical shape and small particle size lower than 1<span class="elsevierStyleHsp" style=""></span>&#956;m were observed &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>d&#41;&#46; Particles with regular and small size in the nanometric scale have been observed in the sulfide solid electrolytes such as Li<span class="elsevierStyleInf">7</span>P<span class="elsevierStyleInf">3</span>S<span class="elsevierStyleInf">11</span> and <span class="elsevierStyleItalic">&#946;</span>-Li<span class="elsevierStyleInf">3</span>PS<span class="elsevierStyleInf">4</span> derived from a liquid phase process&#44; especially using aprotic solvents such acetonitrile or tetrahydrofuran <a class="elsevierStyleCrossRefs" href="#bib0345">&#91;26&#44;35&#44;36&#93;</a>&#46; The solvent is also believed to play a surfactant role in the growth of sulfide solid electrolyte particles <a class="elsevierStyleCrossRef" href="#bib0390">&#91;35&#93;</a>&#44; allowing more particles to escape the aggregation process by modification of their interfacial surface tension and resulting in small particles sizes&#46; The mechanism of the precipitation of sulfide solid electrolyte by a liquid phase process involves the formation of intermedium complexes between particles and solvent during the process is known <a class="elsevierStyleCrossRefs" href="#bib0345">&#91;26&#44;32&#44;36&#8211;38&#93;</a>&#46; These complexes may be responsible for changing the surface tension of the particles&#46; The effect is remarkable in the addition of the surfactant&#44; where the surface tension created between the particles and surrounding organic medium &#40;acetonitrile&#44; ethanol&#44; and surfactant&#41; leads to the precipitation of particles with a regular size and shape &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>b and d&#41;&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>a shows AC impedance plots of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte obtained by the liquid phase process without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#46; The Nyquist plots of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte without the surfactant consist in an incomplete resolved semicircle at high frequency &#40;0&#46;7<span class="elsevierStyleHsp" style=""></span>MHz&#41; and a capacitive tail at low frequency due to the interface between the ionic conductor and blocking stainless steel electrodes&#46; The lower resistance of the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant results in a capacity tail with very few points at higher frequencies &#40;0&#46;4<span class="elsevierStyleHsp" style=""></span>MHz&#41;&#46; Both impedance spectra were fitted with a linear fit of a capacitive tail to assess the resistance value of <span class="elsevierStyleItalic">Z</span>&#8242; at the intercept with the real axis&#46; This total resistance consists of grain and grain boundary contributions and achieves 986&#46;2<span class="elsevierStyleHsp" style=""></span>&#937; and 464&#46;2<span class="elsevierStyleHsp" style=""></span>&#937; for Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#44; respectively&#46; The ionic conductivity of the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl attains 0&#46;9<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;4</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> &#40;<span class="elsevierStyleItalic">&#961;</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;43<span class="elsevierStyleHsp" style=""></span>g<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;3</span>&#41; and 2<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;4</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> &#40;<span class="elsevierStyleItalic">&#961;</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;43<span class="elsevierStyleHsp" style=""></span>g<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;3</span>&#41; at room temperature for the samples derived from the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solution without and with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#44; respectively&#46; The difference of ionic conductivity of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl derived from solution without and with the surfactant must be attributed to the different morphology of each powder observed by SEM as described above &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46; Although the density does not change significantly&#44; the regular distribution of particle size may produce better densification and lithium-ions percolation &#40;i&#46;e&#46;&#44; less porous or void microstructure&#41; by cold-press procedure and therefore a better ionic conductivity&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0085" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>b shows the temperature dependence of the ionic conductivity of the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl derived from the solution with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant between 22<span class="elsevierStyleHsp" style=""></span>&#176;C and 84<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; The activation energy of 0&#46;22<span class="elsevierStyleHsp" style=""></span>eV was obtained using the slope of the curve&#46; <a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>c shows the cyclic voltammogram of the Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl derived from the solution with 0&#46;1<span class="elsevierStyleHsp" style=""></span>wt&#37; surfactant&#44; from &#8722;0&#46;5<span class="elsevierStyleHsp" style=""></span>V to 5<span class="elsevierStyleHsp" style=""></span>V &#40;vs&#46; Li&#47;Li<span class="elsevierStyleSup">&#43;</span>&#41;&#46; The lithium deposition &#40;Li<span class="elsevierStyleSup">&#43;</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>e<span class="elsevierStyleSup">&#8722;</span><span class="elsevierStyleHsp" style=""></span>&#8594;<span class="elsevierStyleHsp" style=""></span>Li&#41; and dissolution &#40;Li<span class="elsevierStyleHsp" style=""></span>&#8594;<span class="elsevierStyleHsp" style=""></span>Li<span class="elsevierStyleSup">&#43;</span><span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>e<span class="elsevierStyleSup">&#8722;</span>&#41; reactions were observed in the potential range of &#8722;0&#46;5<span class="elsevierStyleHsp" style=""></span>V to 0&#46;5<span class="elsevierStyleHsp" style=""></span>V&#44; corresponding to cathodic and anodic current peaks&#46; The absence of any electrochemical response in the range of the potential up to 5<span class="elsevierStyleHsp" style=""></span>V suggests high electrochemical stability of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl obtained by the two-step liquid phase process&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">The ionic conductivity of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl prepared by ball-milling process depends on parameters such as time of milling &#40;5&#8211;50<span class="elsevierStyleHsp" style=""></span>h&#41; and further heat treatment &#40;cooling-heating&#41; up to ca&#46; 550<span class="elsevierStyleHsp" style=""></span>&#176;C <a class="elsevierStyleCrossRefs" href="#bib0370">&#91;31&#44;33&#44;39&#8211;43&#93;</a>&#46; In general terms&#44; high-crystallized sample achieves 10<span class="elsevierStyleSup">&#8722;3</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> and low activation energy of around 0&#46;16<span class="elsevierStyleHsp" style=""></span>eV&#44; while low-crystallized sample displays lower ionic conductivity &#40;10<span class="elsevierStyleSup">&#8722;4</span>&#8211;10<span class="elsevierStyleSup">&#8722;5</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span>&#41; and higher activation energy around 0&#46;3&#8211;0&#46;4<span class="elsevierStyleHsp" style=""></span>eV <a class="elsevierStyleCrossRefs" href="#bib0370">&#91;31&#44;33&#44;39&#8211;43&#93;</a>&#46; Rao et al&#46; <a class="elsevierStyleCrossRef" href="#bib0380">&#91;33&#93;</a> have studied the mechanism of formation of argyrodite Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl phase by ball milling and subsequent heat-cooling treatment&#46; Their studies of heat-cooling treatment suggest the formation of Li<span class="elsevierStyleInf">7</span>PS<span class="elsevierStyleInf">6</span> phase during the first stage of the argyrodite phase&#44; where temperatures&#58; ca&#46; 190<span class="elsevierStyleHsp" style=""></span>&#176;C are needed to incorporate Cl in the structure &#40;Li<span class="elsevierStyleInf">7&#8722;<span class="elsevierStyleItalic">x</span></span>PS<span class="elsevierStyleInf">6&#8722;<span class="elsevierStyleItalic">x</span></span>Cl<span class="elsevierStyleInf"><span class="elsevierStyleItalic">x</span></span>&#41;&#44; ca&#46; 250<span class="elsevierStyleHsp" style=""></span>&#176;C are required to obtain the stoichiometric Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl phase&#44; and &#62;250<span class="elsevierStyleHsp" style=""></span>&#176;C are used to increase the crystallinity of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl phase&#46; Thus&#44; the substoichiometric Li<span class="elsevierStyleInf">7&#8722;<span class="elsevierStyleItalic">x</span></span>PS<span class="elsevierStyleInf">6&#8722;<span class="elsevierStyleItalic">x</span></span>Cl<span class="elsevierStyleInf"><span class="elsevierStyleItalic">x</span></span> phases show conductivities around 10<span class="elsevierStyleSup">&#8722;4</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span>&#44; while the stoichiometric Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl phase attains high ionic conductivity of 1<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> and a low activation energy of 0&#46;16<span class="elsevierStyleHsp" style=""></span>eV <a class="elsevierStyleCrossRef" href="#bib0380">&#91;33&#93;</a>&#46; In the present study&#44; Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte obtained by the two-step liquid phase process shows an ionic conductivity of 2<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;4</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> with a low activation energy of 0&#46;22<span class="elsevierStyleHsp" style=""></span>eV&#46; The results suggest that ionic conductivity is governed mostly by the crystallinity of the sample&#44; however&#44; the partial formation of substoichiometric Li<span class="elsevierStyleInf">7&#8722;<span class="elsevierStyleItalic">x</span></span>PS<span class="elsevierStyleInf">6&#8722;<span class="elsevierStyleItalic">x</span></span>Cl<span class="elsevierStyleInf"><span class="elsevierStyleItalic">x</span></span> phases &#40;verified by the small peaks of Li<span class="elsevierStyleInf">2</span>S and LiCl in XRD patterns&#44; <a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>a&#41; could be responsible for the slight reduction in the expected ionic conductivity&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">Compared with analogous argyrodite-type electrolytes prepared by similar liquid-phase synthesis <a class="elsevierStyleCrossRefs" href="#bib0355">&#91;28&#8211;30&#93;</a>&#44; the current argyrodite electrolyte shows a slight enhancement of the ionic conductivity attributed to the regular particle size obtained by using the surfactant&#46; Modifications in the argyrodite electrolyte including their composition or use of additives&#44; easily performed by the liquid-phase synthesis&#44; are believed to be a key to the further enhancement of the ionic conductivity of argyrodite-type electrolytes&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Conclusion</span><p id="par0100" class="elsevierStylePara elsevierViewall">The two-step liquid phase process is a potential technique to prepare sulfide solid electrolytes with high ionic conductivity&#46; Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl solid electrolyte was prepared by a two-step liquid phase process&#44; combining suspension-reaction and dissolution-precipitation processes&#46; Ultrasonic irradiation of Li<span class="elsevierStyleInf">2</span>S&#44; P<span class="elsevierStyleInf">2</span>S<span class="elsevierStyleInf">5</span>&#44; and LiCl precursors using acetonitrile as a solvent for 1<span class="elsevierStyleHsp" style=""></span>h promoted the reaction&#46; The dissolution and subsequent thermal treatment at 180<span class="elsevierStyleHsp" style=""></span>&#176;C lead to the precipitation of the argyrodite crystal phase&#44; and the addition of the surfactant allowed to control of the morphology of Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl particles&#46; As a result&#44; the solid electrolyte achieved a high ionic conductivity of 2&#46;0<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;4</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> with a low activation energy of 0&#46;22<span class="elsevierStyleHsp" style=""></span>eV and electrochemical stability up to 5<span class="elsevierStyleHsp" style=""></span>V &#40;vs&#46; Li&#41;&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conflict of interest</span><p id="par0105" class="elsevierStylePara elsevierViewall">The authors declare no conflict of interest&#46;</p></span></span>"
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          "titulo" => "Introduction"
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          "titulo" => "Experimental"
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    "fechaAceptado" => "2021-12-03"
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            0 => "Sulfide solid electrolyte"
            1 => "Liquid-phase synthesis"
            2 => "Particle size control"
            3 => "High ionic conductivity"
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            0 => "Electrolito s&#243;lido de sulfuro"
            1 => "S&#237;ntesis en fase l&#237;quida"
            2 => "Control del tama&#241;o de part&#237;culas"
            3 => "Alta conductividad i&#243;nica"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">In the present work&#44; argyrodite Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl sulfide solid electrolyte is prepared by a liquid phase process&#44; consisting of two steps&#58; &#40;1&#41; suspension-reaction under the ultrasonication of Li<span class="elsevierStyleInf">2</span>S&#44; P<span class="elsevierStyleInf">2</span>S<span class="elsevierStyleInf">5</span>&#44; and LiCl precursors in acetonitrile and&#44; &#40;2&#41; dissolution-precipitation involving the addition of ethanol&#47;acetonitrile and solvents removal by heating at 180<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; The effect of the addition of a nonionic surfactant on the properties of the sulfide solid electrolyte is also studied&#46; The synthesis process allows to obtain Li<span class="elsevierStyleInf">6</span>PS<span class="elsevierStyleInf">5</span>Cl argyrodite solid electrolyte with high ionic conductivity of 2&#46;0<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;4</span><span class="elsevierStyleHsp" style=""></span>S<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span>&#44; the low activation energy of 0&#46;22<span class="elsevierStyleHsp" style=""></span>eV&#44; and electrochemical stability up to 5<span class="elsevierStyleHsp" style=""></span>V &#40;vs&#46; Li&#41;&#46; A regular particle distribution with a size smaller than 1<span class="elsevierStyleHsp" style=""></span>&#956;m is obtained by the addition of the surfactant&#46;</p></span>"
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        "texto" => "<p id="par0110" class="elsevierStylePara elsevierViewall">The present work was supported by the <span class="elsevierStyleGrantSponsor" id="gs1">Japan Science and Technology Agency &#40;JST&#41;</span>&#44; <span class="elsevierStyleGrantSponsor" id="gs2">Advanced Low Carbon Technology Research and Development Program</span>&#44; and <span class="elsevierStyleGrantSponsor" id="gs3">Specially Promoted Research for Innovative Next Generation Batteries &#40;ALCA-SPRING&#41;</span> project&#46; This research was partially supported by <span class="elsevierStyleGrantSponsor" id="gs4">KAKENHI</span> Grants <span class="elsevierStyleGrantNumber" refid="gs4">JP21H01610</span>&#46; The analysis of SEM was carried out with JIB-4600F at the &#8220;Joint-use Facilities&#58; Laboratory of Nano-Micro Material Analysis&#8221;&#44; Hokkaido University&#44; supported by &#8220;Material Analysis and Structure Analysis Open Unit &#40;MASAOU&#41;&#8221;&#46;</p>"
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