Progress and Perspective of All-Solid-State Lithium Batteries with High Performance at Room Temperature

To boost the energy density as well as address the safety issues, an effective strategy is to replace the liquid electrolytes with solid-state electrolytes (SSEs). However, the current SSEs usually show low ionic conductivity at room temperature and large interfacial impedance with electrodes, which hinders the operation of the all-solid-state lithium batteries (ASSLBs) at room temperature. In this Review, we summarize the recent progress related the fundamental properties, preparation techniques, and electrochemical performance of room-temperature ASSLBs using different types of SSEs, such as polymer-based, oxides-based, and sulfides-based SSEs. We analyze the progress in resolving the issues associated with the low ionic conductivity of polymer-based SSEs and high interfacial resistance and instability of inorganic SSEs. Furthermore, the key issues and critical perspectives to develop high-performance ASSLBs at room temperature are discussed.