| 摘要 |
Batteries, separators, battery packs, electronic devices, electromotive vehicles, power storage apparatus, and electric power systems are provided. In one embodiment, a battery includes a positive electrode, a negative electrode, and an electrolytic solution holding layer between the positive electrode and the negative electrode. The electrolytic solution holding layer includes a porous polymer compound, and an electrolytic solution is held in the porous polymer compound. The porous polymer compound includes 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. The average molecular weight of the vinylidene fluoride polymer is 500,000 or more to less than 1.5 million, and the air permeability of the porous polymer compound is 500 seconds/100 cc or less. |
