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. 03, 2009
Filed:
Mar. 30, 2005
Applicants:
Hideo Sakata, Ibaraki, JP;
Hayato Higuchi, Ibaraki, JP;
Fusaji Kita, Ibaraki, JP;
Inventors:
Assignee:
Hitachi Maxell, Ltd., Ibaraki-shi, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 4/58 (2006.01);
U.S. Cl.
CPC ...
Abstract
A nonaqueous secondary battery comprising an electrode body which comprises a positive electrode and a negative electrode laminated with a separator interposed between them, and a nonaqueous electrolyte, wherein said negative electrode comprises graphite as a negative electrode active material, and has a coating density of at least 1.70 g/cm, pore diameter of the maximum of less than 0.5 μm, and the logarithmic value of differential intrusion of at least 0.14 cm/g at the pore diameter of the maximum.