Patent ID: 8133610

Claim:
A battery comprising a cathode, an anode, and an electrolyte, wherein: the electrolyte contains an electrolytic solution and a polymer compound that contains a ternary system copolymer containing vinylidene fluoride, hexafluoropropylene, and monomethylmaleic acid ester as a component, copolymerization amounts of the hexafluoropropylene and the monomethylmaleic acid ester in the ternary system copolymer are respectively in a range from 4 wt % to 7.5 wt %, and in a range from 0.3 wt % to 2 wt %, and a weight average molecular weight of the ternary system copolymer is in a range from 0.6 million to 1.5 million; the electrolytic solution contains a solvent and an electrolyte salt, a concentration of the electrolyte salt in the electrolytic solution is in a range from 0.8 mol/kg to 1.7 mol/kg; the cathode contains a cathode active material and a cathode binder that contains a polymer containing vinylidene fluoride as a component; and the anode contains an anode active material and an anode binder that contains a binary system copolymer containing vinylidene fluoride and monomethylmaleic acid ester as a component, and a copolymerization amount of the monomethylmaleic acid ester in the binary system copolymer is in a range from 0.3 wt % to 2 wt %.