Impact Of Hydration On Ion Transport In Li2sn2s5 Center Dot Xh(2)O
JOURNAL OF MATERIALS CHEMISTRY A(2021)
摘要
This work investigates the structure and transport properties of the layered material Li2Sn2S5 center dot xH(2)O. The anhydrous phase shows a room-temperature Li+ diffusivity below 10(-9) cm(2) s(-1) and conductivity below 10(-5) S cm(-1). Upon exposure to humidity, water intercalates between the layers and increases the interlayer distance, inducing first-order transitions to a hydrated phase (x approximate to 2-4) and then to a second hydrated phase (x approximate to 8-10). The latter is soft and sticky but remains solid. Diffusion of both Li+ ions and H2O remains predominantly two-dimensional under all conditions. The Li+ diffusivity and conductivity both increase by three orders of magnitude upon hydration, reaching values of 5 x 10(-7) cm(2) s(-1) and 10(-2) S cm(-1) in the second hydrate. These transport rates are extraordinary for a solid electrolyte and approach what is typically seen in aqueous solutions. The material Li2Sn2S5 center dot xH(2)O thus bridges the gap between a hydrated solid electrolyte and a confined liquid electrolyte, which is scientifically interesting and potentially useful in battery applications. In the light of these findings, a previous work on Li2Sn2S5 from our groups is revisited.
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