Showa Denko K.k.

Posco Chemtech

Akinori Sudoh

Chiaki Sotowa

Masataka Takeuchi

Yasuaki Wakizaka

Tomohiro Abe

Yoshiyuki Nishimura

Shunsuke Yoshioka

Takashi Terashima

Satoshi Iinou

Akimitsu Ishihara

Masako Tanaka

Yuuichi Kamijou

Yuichi Kamijo

Yoshiki Shimodaira

Yoshihito Yokoyama

Ken-ichiro Ota

Ryuji Yamamoto

Kunio Nishimura

Takashi Ohkubo

Jong-Sung Kim

Naoto Kawaguchi

Takayuki Fukai

Jung-Min Han

Chul Youm

Jeong-Hun Oh

Kyung-Hee Han

A scale-like graphite and carbon material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, wherein the ratio I/I(G value) between the peak area (I) in a range of 1300 to 1400 cmand the peak area (I) in a range of 1580 to 1620 cmby Raman spectroscopy spectra, in which an edge surface of the particle of the scale-like graphite is measured with by a Raman microspectrometer, is 5.2 to 100 and the average interplanar spacing d002 of plane (d002) by the X-ray diffraction method is 0.337 nm or less and optical structures of the scale-like graphite have a specific shape; the method for producing the same; a carbon material for a battery electrode and a paste for an electrode containing the material; and a secondary battery having excellent charge/discharge cycle characteristics and high current load characteristics.

Carbon material, carbonaceous material for battery electrode, and battery

A carbon negative electrode material for a lithium secondary battery includes: a core carbon material; and a coated layer covering the core carbon material and comprising a carbon coating material and carbon fiber.

Carbon negative electrode material for lithium secondary battery, production method thereof and lithium secondary battery using the same

A carbon material containing boron atom in an amount of 0.001 to 0.5 mass %, in which the average interplanar spacing (d002) of plane (002) is 0.337 nm or less. By observing optical structures in cross-section of formed bodies made of the carbon material, when areas are accumulated from a smallest structure in an ascending order, SOP represents an area of an optical structure whose accumulated area corresponds to 60% of the total area of all optical structures; when the structures are counted from a structure of a smallest aspect ratio in an ascending order, AROP represents the aspect ratio of the structure which ranks at the position of 60% in total number of all the structures; and when D50 represents an average particle diameter; SOP, AROP and D50 satisfy the following relationship: 1.5&#x2266;AROP&#x2266;6 and 0.2&#xd7;D50&#x2266;(SOP&#xd7;AROP)&#x3c;2&#xd7;D50. Also disclosed is a secondary battery using the carbon material as an electrode material.

Carbon material, carbon material for battery electrode, and battery

A graphite material having pores which, when 200 rectangular regions of 6 &#x3bc;m&#xd7;8 &#x3bc;m are randomly selected in a surface image of the graphite material observed by a scanning electron microscope, in the surface of the graphite material appearing in the regions, a pore appearing on the surface and having an aperture in a shape having a diameter of 15 nm to 200 nm, a circularity degree of 0.75 to 1.0 and a major axis/minor axis ratio of 1.0 to 1.5 is visible in two regions or more. Also disclosed is a carbon material for battery electrodes, a paste for electrodes, an electrode and a lithium ion secondary battery including the graphite material.

Graphite material, carbon material for battery electrode, and battery

A graphite carbon composite material including a graphite material having diversity in the sizes of optical anisotropic structure and optical isotropic structure, the ratio thereof, and crystal direction, and a carbon material on the way to a graphitized structure of easily-graphitizable carbon. Also disclosed is a carbon material for a battery electrode, a past for an electrode, an electrode, a battery, a lithium ion secondary battery and a method of producing the graphite carbon composite material.

Graphite carbon composite material, carbon material for battery electrodes, and batteries

A graphite composite material obtained by mixing graphite materialhaving diversity in the sizes of optical anisotropic structure and optical isotropic structure, the ratio thereof, and crystal direction, and graphite material 2 having a rhombohedron structure, which is different from graphite material 1 and has an average interplanar spacing dof plane (002) of 0.3354 nm to 0.3370 nm measured by the powder X-ray diffraction method and Lc of 100 nm or more. Also disclosed is a carbon material for a battery electrode, a paste for an electrode, an electrode, a battery, a lithium ion secondary battery and a method of producing the graphite composite material.

Graphite material, carbon material for battery electrodes, and batteries

A graphite material suitable as an electrode material for non-aqueous electrolytic secondary batteries; a method for producing the same and a carbon material for battery electrodes; and a secondary battery. The graphite material includes crystallite graphite particles wherein an oxygen amount (a) (mass %) in a region from a particle surface of the graphite material to a depth of 40 nm is within a range of 0.010&#x2266;(a)&#x2266;0.04 as determined by a peak intensity of Oobtained by HAX-PES measurement using a hard X-ray of 7,940 eV.

Graphite material, method for producing same, carbon material for battery electrodes, and battery

Disclosed are a negative electrode for lithium secondary batteries, containing an active material (A) capable of absorbing/desorbing lithium ions and a binder (B), wherein the active material (A) is a carbon-based material obtained from at least one starting material selected from a group consisting of petroleum cokes and coal cokes and having a mean particle size of from 1 to 30 and a true density of from 1.90 to 2.00 g/cmand its use; and a method for producing a carbon-based negative electrode active material having a mean particle size of from 1 to 30 &#x3bc;m and a true density of from 1.90 to 2.00 g/cm, the method comprising (a) a step of grinding at least one selected from a group consisting of petroleum cokes and coal cokes, (b) a step of controlling the particle size, and (c) a step of heat-treating in an inert gas atmosphere at 900 to 1900&#xb0; C.

Negative electrode for lithium secondary battery, method for producing carbon-based negative electrode active material, lithium secondary battery and use thereof

A carbon raw material such as a green coke in which loss on heat when it is heated from 300 to 1200&#xb0; C. under an inert atmosphere is no less than 5% by mass and no more than 20% by mass is pulverized and then the pulverized carbon raw material is graphitized to obtain a graphite material suitable for a carbon material for anode in a lithium-ion secondary battery or the like that enables to make electrodes having a high-energy density and a large-current load characteristic since it has a small specific surface area and a small average particle diameter while maintaining high beginning efficiency and a high discharge capacity in the first round of charging and discharging. And an electrode for batteries are obtained using the graphite material.

Provided are a graphite material suitable as an electrode material for nonaqueous electrolyte secondary batteries, a carbonaceous material for battery electrodes, and secondary batteries which exhibit excellent charge-discharge cycle characteristics and excellent severe-current-load characteristics. A graphite material which has specific sizes of optically anisotropic and isotropic structures, a specific content ratio between both structures, and various orientation of crystallization; and a carbonaceous material for battery electrodes which is made using the graphite material and which exhibits a large discharge capacity and a small irreversible capacity with the severe-current-load characteristics and cycle characteristics being kept at high levels.

Graphite material, carbonaceous material for battery electrodes, and batteries

A catalyst carrier, being characterized in that a catalyst metal for promoting an oxidation-reduction reaction is carried on a vapor-grown carbon fiber having an average outer diameter of from 2 nm to 500 nm, which has been subjected to a crushing treatment so as to have a BET specific surface area of from 4 m/g to 100 m/g and an aspect ratio of from 1 to 200, and exhibiting high activity per unit amount of a catalyst metal, a low reaction resistance and an improved output density, and is useful for a fuel cell; a production method thereof and a fuel cell using the catalyst carrier.

Catalyst carrier and fuel cell using the same

The invention relates to a high-density electrode, obtained by impregnating a high-density electrode which comprises an electrode active substance and carbon fiber having a fiber filament diameter of 1 to 1,000 nm and has a porosity of 25% or less, with a solid polymer electrolyte; and to a battery including the resultant (high-density) electrode. According to the invention, electrolytic solution permeability and electrolytic solution retainability, which are matters of importance in realizing a high-density electrode for achieving a battery having a high energy density, can be improved.

High density electrode and battery using the electrode

A graphitized fine carbon fiber comprising a hollow space extending along its center axis, and a plurality of graphene sheets, wherein the fiber has an end surface comprising a portion of discontinuity in which ends of graphene sheets are not bonded to one another and at least one portion of continuity comprised of at least one group of graphene sheets in which one graphene sheet is bonded to another graphene sheet adjacent thereto.

Graphite fine carbon fiber, and production method and use thereof

The present invention relates to graphite powder and to a battery using it as a negative electrode material, the powder having a specific surface area of not more than 3 m/g, an aspect ratio of not more than 6, and a tapping bulk density of not less than 0.8 g/cm; or a tapping bulk density of not less than 0.8 g/cmand an oxidation initiation temperature of not less than 600&#xb0; C.; or a specific surface area of not more than 3 m/g and a tapping bulk density of not less than 0.8 g/cm, a specific electrical resistance of the powder not more than 0.06 &#x3a9;cm in the specified condition. The battery obtained thus has a large discharge capacity, good cycle property and high charge and discharge efficiency.

Growing community of inventors

Tokyo, Japan

Akinori Sudoh