Patent ID: 9350005
Filing Date: 2016-05-24
CPC Classification: H01M,Y02E,Y02P,Y02T,Y10T

Claim Text:
1. A battery comprising: a positive electrode; a negative electrode; an electrolytic solution holding layer between the positive electrode and the negative electrode, wherein the electrolytic solution holding layer is provided on at least one surface of a base material layer, the electrolytic solution holding layer comprising a porous polymer compound including inorganic particles and a vinylidene fluoride polymer selected from the group consisting of (1) a vinylidene fluoride homopolymer and (2) a copolymer including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, wherein a mass ratio of the vinylidene fluoride polymer and the inorganic particles is 1:1 to 1:8, wherein the average molecular weight of the vinylidene fluoride polymer is 750,000 or more to less than 1.5 million, and wherein an air permeability of the porous polymer compound is 500 seconds/100 cc or less; and an electrolytic solution held in the porous polymer compound.