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:
Jan. 01, 2002
Filed:
Dec. 16, 1999
Shinichiro Yamada, Kanagawa-ken, JP;
Hiroshi Imoto, Kanagawa-ken, JP;
Hideto Azuma, Kanagawa-ken, JP;
Tadashi Senoo, Tokyo, JP;
Koji Sekai, Kanagawa-ken, JP;
Masayuki Nagamine, Fukushima-ken, JP;
Atsuo Omaru, Fukushima-ken, JP;
Naohiro Sonobe, Fukushima-ken, JP;
Jiro Masuko, Tokyo, JP;
Minoru Ishikawa, Fukushima-ken, JP;
Other;
Abstract
A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent secondary battery, is constituted by a carbonaceous material having a true density as measured by a butanol substitution method of at most 1.46 g/cm , a true density as measured by a helium substitution method of at least 1.7 g/cm , a hydrogen-to-carbon atomic ratio H/C of at most 0.15 as measured according to elementary analysis, a BET specific surface area of at most 50 m /g as measured by nitrogen adsorption BET method, and a carbon dioxide adsorption capacity of at least 10 ml/g. The carbonaceous material is advantageously produced by carbonizing an organic material originated from bamboo genera of family Gramineae, particularly genus Pleioblastus or Bambusa, at 1000-1400° C. under a reduced pressure or under a flowing inert gas stream to provide an appropriate porous structure.