Patent Number: 8,574,761

Title: Battery

Abstract: A battery including a positive electrode, a negative electrode and an electrolytic solution, wherein the negative electrode has a negative electrode active material layer containing a carbon material and a binder and having a thickness per one face of 70 .mu.m or more and not more than 120 .mu.m; and the binder contains a copolymer A which is obtained by copolymerizing 100 parts by weight of polyvinylidene fluoride (PVDF) and from 0 to 4 parts by weight of hexafluoropropylene (HFP) and a copolymer B which is obtained by copolymerizing 100 parts by weight of polyvinylidene fluoride and from 5 to 12 parts by weight of hexafluoropropylene in a mass content ratio of A/B of from 60/40 to 90/10.

Inventors: Wakita; Shinya (Fukushima, JP), Okae; Izaya (Fukushima, JP)

Assignee: Sony Corporation

International Classification: H01M 4/02 (20060101)

Expiration Date: 1/05/12017