Composite Electrolytes for High-Performance Solid-State Lithium-Ion Batteries

Abstract

All-solid-state lithium-ion batteries (ASSLBs) are emerging as strong contenders for next-generation battery technologies, due to their enhanced safety, higher energy density, and improved power density. However, challenges associated with solid electrolytes, such as low ionic conductivity, poor mechanical integrity, and high interfacial resistance with solid electrodes, remain. Composite polymer electrolytes (CPEs) that offer both high ionic conductivity and structural flexibility can be a potential solution to overcome the above obstacles. In this report, we present a novel CPE developed by in-situ cross-linking of a supporting polymer within a Lithium Lanthanum Titanate (LLTO) nanofiber scaffold. The synthesis and electrochemical characterization of the CPEs are discussed, which demonstrates enhanced performance, including an ionic conductivity of 10 -4 S/cm at room temperature, a critical current density of 0.5 mA/cm 2 at 60 °C, and a low activation energy of approximately 0.2 eV. The lithium-ion transport mechanism will also be discussed.