3. Classification of polymer electrolytes and their limits

The first dry solid polymer electrolytes (EPS) were obtained from lithium salts, such as LiClO ₄ or LiBF ₄ , and the high-molecular-weight poly(oxyethylene) POE . In such systems, no liquid organic solvent is used; the host polymer acts as a solid solvent. POE contains ether coordination sites that enable salt dissociation, as well as a flexible macromolecular structure that promotes ionic transport. Nevertheless, the presence of crystalline zones in POE interferes with ion transport, which requires an amorphous phase. This affects...