Nippon Steel Chemical Co., Ltd.

Tetsusei Fukuda

Yoichi Kawano

Hiromasa Shoji

Takeshi Hamada

Tsutomu Sugiura

Taisa Ikeda

Taro Kohno

This invention relates to a graphite material for negative electrode of lithium secondary battery. This graphite material is obtained by carbonizing the pulverized green coke to yield coke, adding one kind or more of boron or a compound thereof to the coke, graphitizing the resulting mixture and controlling the particle size of the product graphite. This graphite material for negative electrode is characterized by showing a tap density of 0.95 g/cmor more after tapping 20 times or 1.15 g/cmor more after tapping 300 times and a BET specific surface area of 1.5 m/g or less. A lithium secondary battery made by the use of this graphite material for negative electrode has a large discharge capacity and suffers little loss during charging and discharging.

Graphite material for negative pole of lithium secondary battery, method of manufacturing the graphite material, and lithium secondary battery

Provided are an amorphous coke for a special carbon material characterized in that it is an amorphous coke obtained by blending a coal tar base heavy oil and/or a petroleum base heavy oil with a resin and subjecting the mixture to thermal decomposition polycondensation; it has a larger thermal expansion coefficient than that of a coke obtained from a heavy oil alone; and a molded article of the coke is shrunk by 0.3% or more in terms of a volume change rate before and after the treatment when it is subjected to graphitizing treatment, and a production process of an amorphous coke for a special carbon material characterized in that in subjecting a coal tar base heavy oil or a petroleum base heavy oil to thermal decomposition polycondensation, the raw material is blended with a resin to modify a coke crystal structure.

Amorphous coke for special carbon material and production process for the same

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Fukuoka, Japan

Tetsusei Fukuda