All-solid-state sodium (Na) batteries (ASSSBs) attract increasing attention due to the use of high-capacity Na metal anode and solid electrolytes (SEs) with high safety. Recently, significant research achievements have been made in developing Na-ion conductors. In particular, sulfide SEs generally offer higher ionic conductivity (10−4−10−3 S cm−1 at room temperature) and lower grain boundary resistance. However, the practical applications of sulfide-based ASSSBs are significantly hampered by the challenges originating from (1) significant reactions at SE/Na interface; (2) poor solid-solid contact between SE and electrodes. To solve these issues and enhance the electrochemical performance of sulfide-based ASSSBs, here, we design and demonstrate a facile strategy for interface modification between sulfide SE and electrodes. As a result, long-term cycling stability was achieved due to 1) the formation of stable interface to prevent the sever interfacial reactions; 2) the creation of intimate contact between sulfide SEs and electrodes. These methods provide effective strategies to address the challenges between sulfide SEs and Na metal, enabling the successful utilization of Na metal and sulfide SEs in ASSSBs towards next-generation safe and high-energy density energy storage systems.

Interface strategy to enhance the performance of solid-state sodium batteries

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