The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 05, 2013
Filed:
Jan. 22, 2009
Shinya Wakita, Fukushima, JP;
Izaya Okae, Fukushima, JP;
Shinya Wakita, Fukushima, JP;
Izaya Okae, Fukushima, JP;
Sony Corporation, Tokyo, JP;
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 μm or more and not more than 120 μm; 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.