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:
Dec. 30, 2014
Filed:
Jun. 09, 2009
Hiroshi Abe, Osaka, JP;
Toshihiro Abe, Osaka, JP;
Nobuaki Matsumoto, Osaka, JP;
Hideaki Katayama, Osaka, JP;
Hiroshi Abe, Osaka, JP;
Toshihiro Abe, Osaka, JP;
Nobuaki Matsumoto, Osaka, JP;
Hideaki Katayama, Osaka, JP;
Hitachi Maxell, Ltd., Ibaraki-Shi, JP;
Abstract
The present invention provides a lithium secondary battery using a separator including a porous film formed by binding inorganic oxide particles together with a binder. The inorganic oxide particles are treated so that an amount of alkali metal elements eluted therefrom when they are immersed in ion exchange water is reduced to 1000 ppm or less. As a result, it is possible to provide a lithium secondary battery with a high degree of reliability, whose characteristics deteriorate less when it is used or stored for an extended period.