| 摘要 |
PROBLEM TO BE SOLVED: To provide excellent discharge cycle characteristic by comprising an acrylonitrile-butadiene copolymer having a cross-link structure, an ethylene carbonate, a chain carbonate, and an alkali metal salt as main component. SOLUTION: The acrylonitrile-butadiene copolymer is preferably denatured by carboxyl, and the alkali metal salt is preferably a lithium salt. In the acrylonitrile-butadiene copolymer having a crosslink structure which is the skeleton component, a double bond present in the main chain or side chain is cleaved to form an intramoelcular or intermolecular crosslink structure by additive reaction or cyclization reaction. Since the skeleton part has the crosslink structure, the polymer hardly causes a reduction in mechanical strength when finally laid in the state impregnated with an electrolyte. Thus, this electrolyte can reconcile high ion conductivity with high mechanical strength and also keep these characteristics for a long period, and shows excellent charge and discharge cycle characteristic. |
