Flexible and thin sulfide-based solid electrolyte sheet with Li plus -ion conductive polymer network for all-solid-state lithium-ion batteries

All-solid-state lithium batteries (ASSLBs) with solid electrolytes are promising battery systems capable of improving the safety and energy density of current lithium-ion batteries. Reducing the thickness of the solid electrolyte while preventing the short circuit between the anode and cathode is imperative to increase the energy density of ASSLBs. Sulfide-based solid electrolytes have high ionic conductivities; however, they are brittle, difficult to be processed into a thin film, and challenging to form stable interfaces with electrodes of large volume change. In this study, flexible thin-solid electrolyte sheets with Li+-ion conductive polymer network were prepared and characterized for ASSLB applications. They exhibited higher ionic conductance and superior mechanical properties than those of pristine Li6PS5X (argyrodite) pellets. The all-solid-state lithiumion cell (graphite/LiNi0.7Co0.15Mn0.15O2) with a solid electrolyte sheet delivered a high discharge capacity of 182.5 mAh g-1 and showed good cycling stability at 0.33 C and 25 celcius, demonstrating that flexible and thin sheets are promising solid electrolytes for ASSLBs operating at room temperature.

Automated summary

All-solid-state lithium batteries (ASSLBs) with solid electrolytes have the potential to improve the safety and energy density of lithium-ion batteries. In this study, flexible thin-solid electrolyte sheets with Li+-ion conductive polymer network were prepared and characterized for ASSLB applications. The results showed that these sheets exhibited higher ionic conductance and superior mechanical properties compared to conventional Li6PS5X (argyrodite) pellets. The all-solid-state lithium-ion cell with a solid electrolyte sheet delivered a high discharge capacity and good cycling stability at room temperature, demonstrating the promising potential of flexible and thin solid electrolytes for ASSLBs.