Patent ID: 8445140

Claim:
A solid polymer electrolyte (SPE) comprising at least one electrolyte salt and at least one linear triblock copolymer A-B-A, in which: the blocks A are polymers that are prepared from one or more styrene, o-methylstyrene, p-methylstyrene, m-t-butoxystyrene, 2,4-dimethylstyrene, m-chlorostyrene, p-chlorostyrene, 4-carboxystyrene, vinylanisole, vinylbenzoic acid, vinylaniline, vinylnaphthalene, and 9-vinylanthracene, 1 to 10C alkyl methacrylates, 4-chloromethylstyrene, divinylbenzene, trimethylolpropane triacrylate, tetramethylolpropane tetraacrylate, 1 to 10C alkyl acrylates, acrylic acid or methacrylic acid monomers; the block B is a polymer that is prepared from one or more ethylene oxide (EO), propylene oxide (PO), poly(ethylene glycol) acrylate (PEGA) or poly(ethylene glycol) methacrylate (PEGMA) monomers, the proportion of blocks A of the triblock copolymer A-B-A is 10% to 35% by mass relative to the total mass of the copolymer, the number-average molecular mass of the triblock copolymer A-B-A is from 12,000 to 30,000g/mol, and the amount of electrolyte salt added, defined by the ratio [central block B]/[Li] in moles is 15 to 30.