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:
Mar. 20, 2012
Filed:
Jun. 15, 2006
Satoshi Nakashima, Ibaraki, JP;
Yasushi Usami, Shiga, JP;
Akihiko Sakai, Shiga, JP;
Manabu Hayashi, Tokyo, JP;
Ryoichi Kato, Ibaraki, JP;
Satoshi Nakashima, Ibaraki, JP;
Yasushi Usami, Shiga, JP;
Akihiko Sakai, Shiga, JP;
Manabu Hayashi, Tokyo, JP;
Ryoichi Kato, Ibaraki, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Mitsubishi Plastics, Inc., Tokyo, JP;
Abstract
A subject for the invention is to improve the cycle characteristics of a high-capacity secondary battery containing an active material packed at a high density, by using a particulate active material having a low aspect ratio. The invention relates to a nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, characterized in that the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; and the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 2.2.