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.