Abstract
Due to their high ionic conductivities, sulfide-based solid electrolytes (SEs)—such as argyrodite Li6PS5Cl—are good candidates for all-solid-state lithium-ion batteries (ASSLIBs). For adequate energy density, the thinner SE layers of ASSLIBs, the better, but it must also be durable to avoid short circuits. Using SiO2 fibers in the SE layer as a support, we used a liquid process to produce all-inorganic, self-standing-sheet argyrodite-SEs with a thickness of approximately 60 μm, without resorting to organofluorine compounds such as polytetrafluoroethylene (PTFE) or polyvinylidene difluoride (PVDF). The ionic conductivity of a sheet containing 20 % SiO2 fibers was 4.2 × 10−4 S cm−1 at 25 °C. We also prepared graphite composites as anodes using argyrodite SE containing SiO2 fibers. In addition, we fabricated ASSLIB cells using these SE sheets, Ni1/3Mn1/3Co1/3O2-composite positive, and graphite-composite negative electrodes and evaluated their charge–discharge characteristics.
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