Mitsubishi Gas Chemical Company, Inc.

Mistubishi Gas Chemical Company, Inc.

Mitsubishi Gas Chemical Company Co., Inc.

Honda Motor Co., Ltd.

Koichi Kanno

Nobuyuki Koike

Takeshi Fujino

Hitoshi Sakamoto

Hirotaka Tsuruya

Yuzuru Takahashi

Jitsuo Oishi

Yukio Sakai

Ryuji Fujiura

Yasuhiro Hirai

Takahumi Yoshimura

Kyoko Shibahara

Takaaki Higashiizumi

Takashi Kojima

Ryusuke Shigematsu

Takuo Ohshida

Takahiro Ojima

Takeshi Koshikawa

Fumitaka Watanabe

Yuzuru Takahasi

Provided is a production process for a carbon material comprising an alkali activation reaction step in which a carbon precursor containing an activator selected from alkali metal compounds is heated under flow of inert gas. The above alkali activation reaction is carried out while allowing carbon dioxide gas to flow into a downstream part of an alkali activation reaction region on the condition that the carbon dioxide gas is not substantially brought into contact with the carbon precursor and the activator. This makes it possible to carry out alkali activation treatment safely and stably and obtain a carbon material useful for producing an electric double layer capacitor electrode having a high electrostatic capacity.

Process for producing carbon material and alkali activation apparatus

Provided is a production process for a carbonized product characterized by comprising the following steps (a) to (b):

Production process for carbonized product and carbonized product obtained by the same process

A carbon material for electric double layer capacitor electrodes which is obtained by a heat treatment and an activation treatment of a material pitch having a softening point in a range of 150 to 350&#xb0; C., a ratio of amounts by atom of hydrogen to carbon (H/C) in a range of 0.50 to 0.90 and a content of optically anisotropic components of 50% or greater. The material pitch is preferably a synthetic pitch obtained by polymerizing a condensed polycyclic hydrocarbon such as naphthalene, methylnaphthalene, anthracene, phenanthrene, acenaphthene, acenaphthylene and pyrene in the presence of an ultra-strong acid catalyst such as a hydrogen fluoride-boron trifluoride complex. Electric double layer capacitors having a high electrode density and a high electrostatic capacity per unit volume can be constructed using the carbon material.

Carbon material for electric double layer capacitor electrodes

When a pitch composition prepared by mixing 100 parts by weight of mesophase pitch with 10 to 1,000 parts by weight of coal tar pitch, is heat-treated at a temperature of 500&#xb0; C. or higher, it is possible to produce a high-density coke at a high yield while avoiding the foaming of the mesophase pitch. In addition, when the coke is graphitized at a temperature of 2,000&#xb0; C. or higher, it is possible to obtain an artificial graphite having a high graphitization degree. Further, when the coke is first pulverized and then graphitized at a temperature of 2,000&#xb0; C. or higher, it is possible to obtain a high-crystallinity graphite powder which can be suitably used as a carbon material for a negative electrode of non-aqueous solvent type secondary battery having a high discharge capacity and a high charge-discharge efficiency.

Processes for producing coke, artificial graphite and carbon material for negative electrode of non-aqueous solvent type secondary battery and pitch composition used therefor

A carbon foam obtained by heat-treating a mesophase pitch whose softening point is 300&deg; C. or less according to an elevated flow tester, whose ratio (Daromatic/Daliphatic) of the absorption intensity of an aromatic C&mdash;H stretching vibration, measured with FT-IR, to the absorption intensity of an aliphatic C&mdash;H stretching vibration, measured with FT-IR, is 4.0 or less and whose optically anisotropic content is at least 80%, a graphite foam obtained by heat-treating the carbon foam recited above at a temperature of 2,000&deg; C. or higher and production processes of these.

Carbon foam, graphite foam and production processes of these

A carbonaceous material for use as an anode material in secondary batteries using non-aqueous solvent comprises a material obtained by calcining a solid, the solid, in turn, being obtained by heating tar and/or pitch with furfural in the presence of an acid catalyst, the use of the resulting anode material imparting to the battery a relatively large capacity while having only a small irreversible capacity loss in the first cycle.

Anode material for non-aqueous lithium secondary batteries, a method for the production thereof, and batteries using such anode materials

A method for preparing a modified optically isotropic pitch comprising, preparing a synthetic pitch by reacting a member selected from the group consisting of a conjugated polycyclic hydrocarbon containing a low molecular weight alkyl group or a material containing such a substituted hydrocarbon in the presence of hydrofluoric acid/boron trifluoride, and treating the synthetic pitch by passing an oxidizing gas through the synthetic pitch at elevated temperatures.

Method for producing isotropic pitch, activated carbon fibers and carbon materials for non-aqueous secondary battery anodes

Method for producing isotropic pitch, activated carbon fibers and carbon

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Okayama, Japan

Koichi Kanno