Patent ID: 7468226

Claim:
A solvent-free polymer electrolyte comprising: a film having a first surface and a second surface, wherein said film comprises a reticulated network of channels forming pores on the first and second surfaces, and is made of a mixture comprising a first polymer and a second oligomer, the first polymer being at least one selected from the group consisting of poly(vinylidene fluoride-co-hexafluoropropylene) copolymers, polyvinylidenefluorides, polymethylmethacrylates, polyacrylonitriles, polyethyleneoxides, and celluloses having a polyether chain, and the second oligomer being at least one selected from the group consisting of poly(ethylene oxide-co-ethylene carbonate) copolymers with at least one terminal groups substituted by a halogen atom and polyethyleneglycols with at least one terminal groups substituted by a halogen atom; and an electrolyte comprising said second oligomer and a lithium salt, said electrolyte partially , or completely filling the pores formed by said network, wherein said each of the first polymer and the second oligomer is present in the mixture in an amount capable of forming a single phase.