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:
Oct. 12, 2004
Filed:
Feb. 22, 2001
Applicant:
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 4/58 ; H01M 4/60 ; H01M 6/00 ; H01B 1/04 ; C01B 3/100 ;
U.S. Cl.
CPC ...
H01M 4/58 ; H01M 4/60 ; H01M 6/00 ; H01B 1/04 ; C01B 3/100 ;
Abstract
A rechargeable nonaqueous electrolyte secondary battery has a positive electrode which can be doped with lithium ions and de-doped thereof, a nonaqueous electrolyte solution and a negative electrode. The negative electrode active material is a carbon material including at least two component: (a) flake graphite particles; and (b) a non-flake graphite material whose surface is covered with amorphous carbon. This secondary battery has a high capacity and is excellent charging/discharging efficiency.