Kureha Corporation

Kuraray Co., Ltd.

Tsukishima Kikai Co., Ltd.

Kuraray Chemical Co., Ltd.

Mayu Komatsu

Naohiro Sonobe

Yasuhiro Tada

Makoto Imaji

Kayoko Okada

Hideharu Iwasaki

Hiroshi Imoto

Hajime Komatsu

Jiro Masuko

Kiyoto Otsuka

Shota Kobayashi

Kenichi Koyakumaru

Koji Miwa

Junichi Arima

Akimi Ogawa

Shinya Tago

Yasushi Ebihara

Kokei Ueno

Takanori Baba

There are provided a method capable of producing a large amount of a carbonaceous material for a negative electrode of a non-aqueous electrolyte secondary battery from a carbon precursor impregnated with an alkali metal element or an alkali metal compound, and an apparatus for performing such production. The method for producing a carbonaceous material for a negative electrode of a non-aqueous electrolyte secondary battery includes a heat treatment step of feeding a carbon precursor containing an elemental alkali metal and/or an alkali metal compound, heating the carbon precursor in a temperature range from 1000&#xb0; C. to 1500&#xb0; C. in a non-oxidizing gas atmosphere to produce a carbonaceous material, and discharging the carbonaceous material; and an exhaust gas treatment step of contacting a non-oxidizing exhaust gas containing a gas and a flying carbonaceous matter evolved in the heat treatment step with water or an aqueous solution to treat the exhaust gas.

Method for producing carbonaceous material for negative electrode of non-aqueous electrolyte secondary battery and production apparatus thereof

An object of the present invention is to provide a carbonaceous molded article for electrodes having high charge/discharge capacity, high initial charge/discharge efficiency, and excellent cycle life without a polymeric binder. The above object can be achieved by the carbonaceous molded article for electrodes of the present invention comprising a carbon fiber nonwoven fabric, the article having a thickness of not greater than 1 mm, an atomic ratio (H/C) of hydrogen atoms and carbon atoms according to elemental analysis of not greater than 0.1, a porosity determined from a bulk density and a butanol true density of the molded article of 25 to 80%, and a volatile content of not greater than 5.0 wt %.

Carbonaceous molded article for electrodes and method of manufacturing the same

Provided is a carbonaceous material for a non-aqueous electrolyte secondary battery anode having high discharge capacity per unit volume and excellent storage characteristics. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a true density (&#x3c1;) determined by a pycnometer method using butanol of not less than 1.55 g/cmand less than 1.75 g/cmand a discharge capacity of an anode at 0.05 V to 1.5 V in terms of a lithium reference electrode standard of not less than 180 mAh/g. Furthermore, the slope 0.9/X (Vg/Ah) of a discharge curve calculated from a discharge capacity X (Ah/g) and a potential difference of 0.9 (V) corresponding to 0.2 V to 1.1 V in terms of a lithium reference electrode standard is not greater than 0.75 (Vg/Ah), and an absorbed moisture quantity after storage for 100 hours in a 25&#xb0; C. 50% RH air atmosphere is not greater than 1.5 wt %.

Carbonaceous material for non-aqueous electrolyte secondary battery anode, non-aqueous electrolyte secondary battery anode, non-aqueous electrolyte secondary battery, and vehicle

To provide a carbonaceous material for a non-aqueous electrolyte secondary battery anode that yields an anode for a non-aqueous electrolyte secondary battery having excellent input/output characteristics, and a non-aqueous electrolyte secondary battery having high discharge capacity per unit volume, and a non-aqueous electrolyte secondary battery and a vehicle comprising this non-aqueous electrolyte secondary battery anode. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a number average particle size of from 0.1 to 2.0 &#x3bc;m, a value of a number average particle size divided by a volume average particle size of not greater than 0.3, an average interlayer spacing dof an (002) plane determined by X-ray diffraction of from 0.340 to 0.390 nm, and an atomic ratio (H/C) of hydrogen and carbon of not greater than 0.10.

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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Tokyo, Japan

Mayu Komatsu