Research progress on functional solid polymer electrolytes for lithium batteries

Solid state electrolytes (SSEs) offer superior safety profiles, enhanced electrochemical stability, and expanded electrochemical windows compared with their liquid counterparts. Currently, the commercialization of SSEs is facing severe challenges. This review provides an overview of the latest research on SSEs for lithium batteries, with a focus on wide temperature range operation, optimized interface functionality, inhibition of active component loss, and novel modification strategies such as flame retardant, self-healing, intelligent responsive, and environmentally friendly electrolytes. The application of techniques such as molecular design, in situ polymerization, composite structures, single ion conductors, nano functional components, and special polymers can effectively enhance the performance of advanced SSEs. Future research focus in this field is discussed, including improving ion conductivity, maintaining strength and stability, exploring new material systems, and optimizing electrode interfaces, etc. Such research aims to provide strong support for high-performance solid-state batteries widely used in the fields of electronics, electric vehicles, and energy storage.