Application of Solid Electrolytes in Solid-State Lithium-Ion Batteries

Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China

^* Corresponding author: ldengar@connect.ust.hk

Abstract

With the growing demand for energy storage and the growing concern for environmental protection, solid-state lithium-ion batteries have become a promising technology. Solid electrolyte applications in solid- state lithium-ion batteries are the main topic of this review, which also covers the types, benefits, and drawbacks of these materials. Oxide solid electrolytes have significant advantages such as thermal stability, wide electrochemical window, and high mechanical strength. However, its shortcomings such as low ionic conductivity, poor interface contact and difficult processing also limit its application range. Sulfide electrolytes possess high ionic conductivity but face air stability and interface issues. Halide electrolytes show excellent performance but require further development. The advantages of various materials are combined in composite solid electrolytes. The difficulties in achieving solid electrolytes' full potential in enhancing battery safety, energy density, and cycle life should be the focus of future studies. In this paper, the polymer electrolyte, oxide electrolyte, sulfide electrolyte, halide electrolyte and composite electrolyte in the all-solid-state battery are discussed. The composite solid electrolyte can combine the advantages of various materials and is a promising all-solid-state battery material.