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. 11, 2014
Filed:
Jul. 21, 2006
Hajime Nishino, Nara, JP;
Shuji Tsutsumi, Nara, JP;
Shinji Kasamatsu, Osaka, JP;
Hideharu Takezawa, Nara, JP;
Mikinari Shimada, Kyoto, JP;
Hajime Nishino, Nara, JP;
Shuji Tsutsumi, Nara, JP;
Shinji Kasamatsu, Osaka, JP;
Hideharu Takezawa, Nara, JP;
Mikinari Shimada, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An object of the present invention is to provide an electrode for a lithium ion secondary battery that can ensure a high level of safety even when exposed to severe conditions such as a nail penetration test or crush test, and exhibit excellent output characteristics. The present invention relates to an electrode for a lithium ion secondary battery having a material mixture containing active material particles capable of reversibly absorbing and desorbing lithium, and a current collector that carries the material mixture, wherein a surface of the current collector has recessed portions, and an area occupied by the recessed portions accounts for not less than 30% of an a material mixture carrying area of the current collector. The present invention further relates to an electrode for a lithium ion secondary battery wherein, in a cut surface obtained by simultaneously cutting a material mixture and a current collector vertically to an electrode plane, the maximum depth of recessed portions is not less than 1 μm, or a difference between an average thickness of a current collector and a maximum thickness of the current collector is not less than 0.35 μm.