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:
May. 30, 2006
Filed:
Jul. 17, 2003
Fumio Kato, Kadoma, JP;
Takafumi Oura, Shijonawate, JP;
Yusuke Fukumoto, Moriguchi, JP;
Norihiro Yamamoto, Katano, JP;
Shozo Fujiwara, Neyagawa, JP;
Fumio Kato, Kadoma, JP;
Takafumi Oura, Shijonawate, JP;
Yusuke Fukumoto, Moriguchi, JP;
Norihiro Yamamoto, Katano, JP;
Shozo Fujiwara, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a lithium rechargeable battery including a negative electrode comprising a copper core material, to which is fixed an active material made by mixing artificial graphite particles A obtained by kneading and granulating a base material of pulverized bulk mesophase pitch with pitch in a softened state and/or thermosetting resin, carbonizing the resulting granules at 700 to 1,500° C. and graphitizing the carbonized granules at 2,500 to 3,000° C. with spherical graphite particles B having a high mean circularity, with a view to inhibiting the deterioration in battery capacity through the repeated charge/discharge cycles, which occurs remarkably in a high energy density lithium rechargeable battery, and providing excellent discharge characteristic and safety.