Lithium-ion batteries (LIBs) are promising energy storage devices because of their high energy density and long cycle life. However, the liquid electrolytes used in LIBs still cause the safety concerns due to flammability and leakage problem. Therefore, all-solid-state lithium batteries (ASSLBs) have attracted great attention owing to their enhanced safety and wide operating temperature range. Among the various solid electrolytes, sulfide-based solid electrolytes have been actively studied due to their high ionic conductivities. However, they suffer from the lack of flexibility to make thin sheet. Because of these concerns, the hybrid electrolytes composed of sulfide and polymer can be a good strategy for manufacturing thin sheet. In our study, we employed self-aligned polymer with high thermal stability to make the hybrid solid electrolyte based on highly conductive Li6PS5Cl in the form of thin sheet. Their electrochemical properties are characterized and they are applied to the Li/LiNixCoyMn1-x-yO2 cells. Based on our results, the self-aligned polymer is proposed as a promising filler for preparing the hybrid solid electrolyte in a form of free-standing thin sheet for applications in all-solid-state lithium batteries.
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