Kuraray Co., Ltd.

Kureha Corporation

Kuraray Chemical Co., Ltd.

Shinya Tago

Junichi Arima

Hideharu Iwasaki

Naohiro Sonobe

Yasuhiro Tada

Hajime Komatsu

Jiro Masuko

Kiyoto Otsuka

Kenichi Koyakumaru

Taketoshi Okuno

Kenta Aoki

Makoto Imaji

Mayu Komatsu

Akimi Ogawa

Yasushi Ebihara

Akinori Yamabata

The present invention relates to a carbonaceous material having a pore volume determined by performing Grand Canonical Monte Carlo simulation on an adsorption-desorption isotherm of carbon dioxide of 0.05 cm/g or more and 0.20 cm/g or less, and a ratio of desorption amount to adsorption amount (desorption amount/adsorption amount) at a relative pressure of 0.01 in the adsorption-desorption isotherm of 1.05 or more.

Carbonaceous material, method for producing same, and electrochemical device

The object of the present invention is to provide a carbonaceous material which is obtainable from plant-derived char and has a decreased specific surface area. Further, the object of the present invention is to provide a non-aqueous electrolyte secondary battery having excellent dedoping capacity, non-dedoping capacity, and charge-discharge efficiency. The object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heat-treating plant-derived char which is demineralized in gas-phase, and carbon precursor or volatile organic compound under a non-oxidizing gas atmosphere; and a specific surface area determined by a BET method is 10 m/g or less.

Carbon material for nonaqueous electrolyte secondary battery and method for manufacturing same, and negative electrode using carbon material and nonaqueous electrolyte secondary battery

Provided is a manufacturing method of carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium is sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries. The method for manufacturing a carbonaceous material having an average particle diameter of 3 to 30 &#x3bc;m, for a negative electrode of non-aqueous electrolyte secondary batteries includes the steps of: (1) heating plant-derived char having an average particle diameter of 100 to 10000 &#x3bc;m at 500&#xb0; C. to 1250&#xb0; C. under an inert gas atmosphere containing halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at 1000&#xb0; C. to 1600&#xb0; C. under an non-oxidizing gas atmosphere.

Carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries and method for producing same

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Bizen, Japan

Shinya Tago