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:
Feb. 28, 2012
Filed:
Jun. 12, 2008
Yoshiyuki Muraoka, Osaka, JP;
Takuji Hirano, Wakayama, JP;
Shinji Kasamatsu, Osaka, JP;
Miyuki Nakai, Osaka, JP;
Yoshiyuki Muraoka, Osaka, JP;
Takuji Hirano, Wakayama, JP;
Shinji Kasamatsu, Osaka, JP;
Miyuki Nakai, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separatorand a nonaqueous electrolyte, wherein a material mixture layer containing an active material and a binder is formed on a surface of a current collectorof at least one of the positive electrodeand the negative electrode. The material mixture layer includes a first layerand a second layerwhich are different in volume ratio of the binder to the active material. The volume ratio (A) of the binder in the first layerin contact with the surface of the current collectoris lower than the volume ratio (B) of the binder in the second layer