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. 28, 2006
Filed:
Feb. 28, 2002
Yoichi Kawano, Fukuoka, JP;
Tetsusei Fukuda, Fukuoka, JP;
Tsutomu Sugiura, Fukuoka, JP;
Takeshi Hamada, Chiba, JP;
Hiromasa Shoji, Chiba, JP;
Taro Kohno, Tokyo, JP;
Yoichi Kawano, Fukuoka, JP;
Tetsusei Fukuda, Fukuoka, JP;
Tsutomu Sugiura, Fukuoka, JP;
Takeshi Hamada, Chiba, JP;
Hiromasa Shoji, Chiba, JP;
Taro Kohno, Tokyo, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Abstract
This invention relates to a graphite material for negative electrode of lithium secondary battery. This graphite material is obtained by carbonizing the pulverized green coke to yield coke, adding one kind or more of boron or a compound thereof to the coke, graphitizing the resulting mixture and controlling the particle size of the product graphite. This graphite material for negative electrode is characterized by showing a tap density of 0.95 g/cmor more after tapping 20 times or 1.15 g/cmor more after tapping 300 times and a BET specific surface area of 1.5 m/g or less. A lithium secondary battery made by the use of this graphite material for negative electrode has a large discharge capacity and suffers little loss during charging and discharging.