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:
Jan. 08, 2013
Filed:
Mar. 02, 2011
Noriko Yamashita, Tokushima, JP;
Masato Iwanaga, Tokushima, JP;
Noriko Yamashita, Tokushima, JP;
Masato Iwanaga, Tokushima, JP;
SANYO Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A nonaqueous electrolyte secondary battery includes a positive electrode plate, a negative electrode plate, a separator, and a nonaqueous electrolytic solution. The separator is constituted of a polyolefin microporous membrane constituted of two or more layers of stacked film containing polyethylene and polypropylene, one or both of the surface layers has a polypropylene mixture proportion exceeding 50% by mass and contains inorganic particles, and the nonaqueous electrolytic solution contains a dinitrile compound expressed by CN—(CH)n—CN (where n≧1 and n is an integer). Thus, the nonaqueous electrolyte secondary battery that even when stored at high temperature in a charged state is not prone to positive electrode degradation and has a large post-high temperature storage capacity recovery rate and good cycling characteristics can be provided.