Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1994-08-26
1996-06-18
Bell, Bruce F.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429217, 429232, 264105, 252502, 252510, 423448, 423450, 423460, H01M 458, C01B 3104, H01B 104, C04B 3500
Patent
active
055276431
ABSTRACT:
A non-aqueous solvent-type secondary battery having a large charge-discharge capacity and exhibiting a high utilization rate of an active substance, such as lithium, and an excellent charge-discharge cycle characteristic, can be constituted by using a carbonaceous electrode material having a specific microtexture. The carbonaceous electrode material is characterized by having an average (002)-plane spacing d.sub.002 of 0.336-0.375 nm and a crystallite size in c-axis direction Lc.sub.(002) of at most 50 nm, respectively, as measured by X-ray diffraction method, and an optically anisotropic texture showing a fine mosaic texture when observed through a polarizing microscope. The carbonaceous material may suitably be produced through a process including the steps of: crosslinking a tar or pitch of a petroleum or coal origin, and carbonizing the crosslinked tar or pitch at a temperature of at least 800.degree. C. under a reduced pressure or in an inert gas atmosphere.
REFERENCES:
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patent: 5340670 (1994-08-01), Takami et al.
Patent Abstracts of Japan, vol. 10, No. 258 (C-370) 4 Sep. 1986 & JP-A-61 083 611 (Mitsubishi Petrochem Co., Ltd.) 28 Apr. 1986.
Database WPI, Week 9432, Derwent Publications Ltd., London, GB; AN 94-258102 & JP-A-6 187 991 (Osaka Gas Co., Ltd.) 8 Jul. 1994.
Database WPI, Week 9432, Derwent Publications Ltd., London, GB; AN 94-258086 & JP-A-6 187 972 (Osaka Gas Co., Ltd.) 8 Jul. 1994.
Patent Abstracts of Japan, vol. 18, No. 139 (E-1519) 8 Mar. 1994 & JP-A-05 325 948 (Osaka Gas Co., Ltd.) 10 Dec. 1993.
Iwasaki Takao
Masuko Jiro
Sonobe Naohiro
Bell Bruce F.
Kureha Kagaku Kogyo Kabushiki Kaisha
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