Mitsubishi Gas Chemical Company, Inc.

Japan As Represented by Director General of Ministry of Education, Culture, Sports, Science and Technology National Research Institute for Metals

Mitsubishi Gas Chemical Company Co., Inc.

Sakurai, Naoto

Takahashi, Yuzuru

Kawai, Yoshio

Yuzuru Takahashi

Jitsuo Oishi

Hitoshi Sakamoto

Koichi Kanno

Nobuyuki Koike

Hideo Yamada

Yukio Sakai

Yasuhiro Hirai

Masatoshi Yoshimura

Takaaki Higashiizumi

Takahumi Yoshimura

Kyoko Shibahara

Yoshio Kawai

Kenichi Nakamura

Hirotaka Tsuruya

Hiroaki Shigeta

Naoto Sakurai

An-pang Tsai

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

A method by which a highly active catalyst for the steam reforming of methanol is efficiently produced by a simple process. The catalyst is produced from alloy fine particles obtained by first grinding an Al alloy containing quasi-crystals consisting of aluminum, copper and at least one metal atom selected from Fe, Ru and Os, and then leaching the ground Al alloy.

Process for producing catalyst for steam reforming of methanol

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

A lithium secondary battery employing a non-aqueous media in which the carbonaceous anode material is prepared by the calcination of an organic compound obtained by reacting a precursor organic compound with a lithium salt.

Lithium secondary battery employing a non-aqueous media

A lithium secondary battery employing a non-aqueous electrolyte in which the anode material is prepared by calcining a precursor organic compound obtained from the reaction of at least one polycyclic organic compound with a compound containing nitrogen and sulfur.

Lithium secondary battery employing a non-aqueous electrolyte

The invention provides for a lithium secondary battery using a non-aqueous solvent wherein the anode material is prepared by the pyrolysis of organic compound starting materials obtained by reacting at least one conjugated polycyclic compound with a nitro compound or with a nitrating agent. The anode material contains at least the elements carbon and nitrogen, the nitrogen content ranging from 0.5% to 6% by weight. Eighty percent or more of this nitrogen is bound to carbon by either C--N or C.dbd.N bonds. The ratio of the intensity of the x-ray photoelectron spectroscopy ('XPS') peak observed for the anode material at 401.2.+-.0.2 eV to the intensity of peak observed for the anode material at 398.8.+-.0.4 eV is 1.0:1 or more.

Lithium secondary battery using a non-aqueous solvent

A mixture of carbon powder and a carbonaceous binder is molded and pyrolyzed in an atmosphere of nitrogen to form a carbon molded article for a negative electrode. The properties of the carbon molded article are: an interfacial distance (d002) within a range from 3.38 .ANG. to 3.56 .ANG. measured by X-ray diffraction; and a three-point strength of 100 kgf/cm.sup.2 or greater at room temperature. A lithium secondary battery formed by using this carbon molded article as the negative electrode has a high energy density per unit volume and advantageous charge-discharge characteristics for higher loads.

Molded article for negative electrode, method of producing the same and

A secondary battery comprising a rechargeable positive electrode, a rechargeable lithium-containing negative electrode, a separator allowing the positive electrode and negative electrode to be separated from each other, and organic electrolyte solution for connecting the positive electrode and negative electrode. The negative electrode includes a complex having a carbon molded article made of carbon fiber or carbon powder having an interfacial distance (d.sub.002) of 3.38 to 3.56 .ANG. as measured by X-ray diffraction analysis using silicon as standard material, wherein lithium have been absorbed into the carbon molded article beforehand. The above value of interfacial distance corresponds to 3.36 to 3.48 .ANG. as measured by X-ray diffraction analysis using no standard material.

Secondary battery

Growing community of inventors

Ibaraki, Japan

Yuzuru Takahashi