CARBON PARTICLE, LITHIUM SECONDARY BATTERY NEGATIVE POLE AND LITHIUM SECONDARY BATTERY

Japanese Patent JP3487155

B2

PROBLEM TO BE SOLVED: To obtain a lithium secondary battery of high capacity with excellent cycling characteristics and rapid charge/discharge characteristics by specifying the aspect ratio, compression degree, crystal interlamellar spacing, and specific surface area of carbon particles to be used in the above battery.
SOLUTION: The subject carbon particles to be used in the other subject lithium secondary battery is so designed as to be ≤5 in aspect ratio, ≤25% in compression degree shown by the formula, and in addition, ≤3.4 &angst in crystal interlamellar spacing (d) (002) to afford the battery with high capacity; further, the carbon particles is so designed as to be ≤8 m2/g in specific surface area to make the irreversible capacity at 1st cycle of the battery lower to effect excellent cyclic characteristics of the battery; besides, it is preferable that a plurality of flat particles among the carbon particles are aggregated or coupled together so that their orientation planes are nonparallel with one another. The subject carbon particles can be obtained, for example, by the following process: graphitizable aggregate or graphite, a graphitizable binder and graphitizing catalyst are mixed together and then molded to a specified shape, and the resulting graphite precursor is heat-treated in a non-oxidative atmosphere.

Yoshito Ishii
Koichi Takei
Tatsuya Nishida
Atsushi Fujita
Kazuo Yamada

JP1627898A

January 13, 2004

January 29, 1998

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Hitachi Chemical Co., Ltd.

C04B35/52; C01B31/02; C01B31/04; H01M4/587; H01M10/05; (IPC1-7): C01B31/04; H01M4/02; H01M4/58; H01M10/40

JP9231974A
JP10330107A
JP11139816A

【文献】国際公開95/028011(WO,A1)
【文献】国際公開97/042671(WO,A1)

Hidekazu Miyoshi

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