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. 26, 2002
Filed:
Feb. 11, 2000
Kunio Miyazawa, Tokyo, JP;
Masayasu Nagoshi, Tokyo, JP;
Kenshi Noda, Tokyo, JP;
Takaaki Kondo, Tokyo, JP;
Tetsuo Shiode, Tokyo, JP;
Hidetoshi Morotomi, Tokyo, JP;
Hiromi Okamoto, Tokyo, JP;
Yasuhiro Mogi, Tokyo, JP;
Kazuteru Tabayashi, Tokyo, JP;
Adchemco Corporation, Tokyo, JP;
Abstract
Boron-substituted graphite, which contains N-bonded boron atoms in a small proportion relative to whole substituted boron atoms, is produced by heating a feed fine particulate mixture of an infusibilized carbonaceous material and a boron compound such that the carbonaceous material is carbonized into a carbon structure, raising a temperature of the resulting heated fine particulate mixture promptly to a graphitization treatment temperature in an inert atmosphere unreactive with boron, retaining the graphitization treatment temperature for a time sufficient to allow graphitization of the carbon structure to proceed to a desired extent, and then quickly cooling the resulting graphitized mixture. The boron-substituted graphite is useful as a negative electrode in a lithium-ion secondary battery.