207 Solid Polymer Electrolyte

DOI: 10.1201/9781003161318-207

Solid polymer electrolyte (SPE) is a solvent-free salt solution in a polymer host material that conducts ions through the polymer chains. It usually comprises a polymer matrix and electrolyte, wherein the electrolyte such as a lithium salt dissolves in a polymer matrix.

The first ion-conducting polymer, poly(ethylene oxide) (PEO) complexed/dissolved with alkali metal salt, was discovered in 1973 by Fenton et al. The preparation and the conducting mechanism of a lithium SPE are proposed in Figure 207.1.

Conventional dry SPEs are prepared by complexing/dissolving ionic salts into coordinating polar polymer hosts, namely, PEO, poly(propylene oxide) (PPO), etc. Since this system does ...

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