Tohoku University

Dowa Holdings Co., Ltd.

Stella Chemifa Corporation

Nittetsu Mining Co., Ltd.

Panasonic Corporation

Japan Science and Technology Agency

Dowa Electronics Materials Co., Ltd.

Sony Corporation

Rigaku Corporation

Tokohu University

Kazuyuki Tohji

Hiroyuki Kai

Yoshinori Sato

Norihiro Shimoi

Yasumitsu Tanaka

Akira Kishimoto

Qiwu Zhang

Takafumi Atarashi

Kazutaka Hirano

Yasuhiro Ueyama

Shuzo Tsuchida

Yasushi Taniguchi

Shinji Hashiguchi

Hideyuki Takahashi

Shun Yokoyama

Migaku Takahashi

Hirohisa Kikuyama

Kimitaka Sato

Toshiyuki Kojima

Mikihisa Mizuno

Masahide Waki

Makoto Inoue

Kazunori Kubota

Yuichi Sasaki

Yasutaka Tashiro

Takeyoshi Taguchi

Ryouhei Seki

Atsuo Kasuya

Noboru Osawa

Masaru Namura

Balachandran Jeyadevan

Hiromichi Matsumoto

Koji Yokoyama

Yoshinori Satoh

Andrew Chak Chung Yu

Jeyaderan Balachandran

A method for producing a negative electrode active material for a lithium ion secondary battery, comprising a step of charging either silicon and copper (II) oxide or silicon and copper metal in a pulverization device, pulverizing either the silicon and copper (II) oxide or silicon and copper metal, and simultaneously mixing either silicon and copper (II) oxide or silicon and copper metal thus pulverized. A negative electrode active material for a lithium ion secondary battery is produced by the method.

Method for producing negative electrode active material for lithium ion secondary battery

Provided is a method for producing a catalyst, including: (i) mixing a core metal salt that serves as a material for a core metal, and a complexing agent (a) to produce a core metal complex solution containing a core metal complex; (ii) mixing a shell metal salt that serves as a material for a shell metal, and a complexing agent (b) to produce a shell metal complex solution containing a shell metal complex; (iii) mixing a carbon powder and a dispersing agent to produce a carbon powder dispersion; (iv) mixing the core metal complex solution, the shell metal complex solution, and the carbon powder dispersion, and reducing the core metal complex and the shell metal complex on the carbon powder by using at least one reducing agent; and (v) drying and baking at a predetermined temperature the carbon powder resulting from Step (iv), said carbon powder having a core-shell structure that includes the core metal and the shell metal.

Method for producing core-shell catalyst

A nitrogen-containing carbon material to the present invention comprises a carbon material having a carbon skeleton formed of carbon atoms and nitrogen atoms introduced into the carbon material, wherein part of carbon atoms in the carbon skeleton are substituted with nitrogen atoms. The nitrogen-containing carbon material according to the present invention can be produced by a production method including the steps of bringing the carbon material into contact with a first treatment gas containing a fluorine-containing gas to subject a surface of the carbon material to a fluorination treatment; and bringing the carbon material after being subjected to the fluorination treatment into contact with a second treatment gas containing a nitrogen-containing gas with heating to perform a nitriding treatment.

Nitrogen-containing carbon material and method of manufacturing the same

A negative electrode active material for a lithium ion secondary battery, comprising silicon, copper and oxygen as major constitutional elements, the negative electrode active material for a lithium ion secondary battery, containing fine particles of silicon having an average crystallite diameter (D) measured by an X-ray diffractometry of 50 nm or less, and having elemental ratios, expressed by molar ratios, Cu/(Si+Cu+O) and O/(Si+Cu+O) of from 0.02 to 0.30, wherein the negative electrode active material contains an intermetallic compound of silicon and copper.

Negative electrode active material for lithium ion secondary battery

A manufacturing method of a supported platinum catalyst, includes: generating a platinum group salt solution using platinum group salts and a complexing agent; mixing the platinum group salt solution and a carbon powder dispersion in which carbon powder is dispersed; and adding a reducing agent to a mixed solution of the platinum group salt solution and the carbon powder dispersion, and reducing the platinum group salts to allow the platinum group particles to be supported on the carbon powder.

Supported platinum catalyst and manufacturing method of the same

In the case where a silicon substance having a high theoretical capacity as a negative electrode active material for a lithium ion secondary battery is used as a negative electrode active material, such a negative electrode active material is provided that has a high initial battery capacity and suffers less deterioration in performance even when many cycles of charge and discharge are repeated. A lithium ion secondary battery using the negative electrode active material is provided. Silicon and copper (II) oxide, or silicon, metallic copper and water are pulverized and simultaneously mixed in a pulverization device, thereby providing a negative electrode active material that has good cycle characteristics and a large battery capacity.

Negative electrode active material for lithium ion secondary battery, method for producing the same, negative electrode, and battery

A field electron emission film that is capable of being operated with low electric power and enhancing the uniformity in luminance within the light emission surface contains from 60 to 99.9% by mass of tin-doped indium oxide and from 0.1 to 20% by mass of carbon nanotubes. The film has a structure wherein grooves having a width in a range of from 0.1 to 50 mm are formed in a total extension of 2 mm or more per 1 mmon a surface of the film, and carbon nanotubes are exposed on a wall surface of the grooves. After forming an ITO film containing carbon nanotubes on a substrate, grooves are formed on a surface of the ITO film, and the end portions of the carbon nanotubes exposed to the wall surface of the grooves are designated as an emitter.

Field electron emission film, field electron emission device, light emission device, and method for producing them

The invention is directed to a carbon material dispersion, including: a fluorinated carbon material having a fluorinated surface formed by bringing a treatment gas with a fluorine concentration of 0.01 to 100 vol % into contact with a carbon material under conditions at 150 to 600&#xb0; C.; and a dispersion medium in which the fluorinated carbon material is dispersed.

Dispersion of carbon material and process for producing same

There is provided a high-purity carbon nanotube, which can be produced with simple purification by causing graphite to be hardly contained in crude soot obtained immediately after being synthesized by arc-discharge, and a method for producing the same. Soot containing carbon nanotubes produced by arc-discharge using an anode which contains amorphous carbon as a main component is heated at a temperature of not lower than 350&#xb0; C. to be burned and oxidized, immersed in an acid, heated at a temperature, which is not lower than the heating temperature in the previous burning and oxidation and which is not lower than 500&#xb0; C., to be burned and oxidized, and immersed in an acid again.

Carbon nanotube and method for producing same

Provided is a method for producing a silver fine powder covered with an organic substance, which comprises a step of mixing (i) a dispersion of silver particles covered with a protective material Xthat comprises an organic compound having an unsaturated bond and having a molecular weight of from 150 to 1000 in a liquid organic medium A, (ii) a protective material Xthat comprises an organic compound of which the number of the carbon atoms constituting the carbon skeleton is smaller than that of the organic compound to constitute the protective material X, and (iii) a liquid organic medium B of which the ability to dissolve the protective material Xtherein is higher than that of the liquid organic medium A, thereby promoting the dissolution of the protective material Xin the liquid organic medium B and the adhesion of the protective material Xto the surface of the silver particles. Accordingly, the invention provides an industrial, large-scale mass-production system for a silver fine powder covered with a protective material having a low molecular weight, of which the sintering temperature can be greatly lowered.

Method for production of silver fine powder covered with organic substance, and silver fine powder

A magnetic metal powder having fluidity is provided which is composed of FePt nanoparticles synthesized by the polyol synthesis method that possess fct (face-centered tetragonal) structure and exhibit crystal magnetic anisotropy from immediately after synthesis. Specifically, there is provided a magnetic metal powder having fluidity which is composed of magnetic metal particles whose main components and the contents thereof are represented by the following general formula (1):[TM]Z&#x2003;&#x2003;(1),where T is one or both of Fe and Co, M is one or both of Pt and Pd, Z is at least one member selected from the group composed of Ag, Cu, Bi, Sb, Pb and Sn, X represents 0.3&#x2dc;0.7, and Y represents 0.7&#x2dc;1.0, the balance being impurities unavoidably incorporated during production, which magnetic metal powder has a volumetric ratio of ferromagnetic structure (face-centered tetragonal ratio) as measured by Mossbauer spectroscopy in the range of 10&#x2dc;100%, saturation magnetization &#x3c3;s of 20 emu/g or greater, and average primary particle diameter by transmission electron microscopic observation (TEM) of 30 nm or less.

Magnetic metal powder and method of producing the powder

A method of treating hydrogen sulfide or producing hydrogen which comprises disposing a liquid tank having a photocatalyst electrode comprising a photocatalyst and a liquid tank having a metal electrode so that the two liquid tanks are separated from each other by a cation-exchange membrane, placing a liquid containing either hydrogen sulfide or an organic substance in the liquid tank having the photocatalyst electrode, electrically connecting the photocatalyst electrode to the metal electrode, and exposing the photocatalyst to a light. The liquid to be placed in the liquid tank having the metal electrode preferably is an acidic solution. The photocatalyst preferably comprises a metal sulfide, and preferably is fine particles having a layered nanocapsule structure.

Method of treating hydrogen sulfide, method of producing hydrogen, and photocatalytic-reaction apparatus

A carbon nanotube aggregate and a method for forming a carbon nanotube aggregate are provided. The carbon nanotube aggregate can be formed by treating carbon nanotubes with fluorine gas and sintering the resulting fluorinated carbon nanotubes. A carbon nanotube aggregate can be formed which does not contain a binder or resin matrix.

Method for forming a carbon nanotube aggregate

A photocatalyst which has high catalytic activity, is nontoxic, has a long life, can utilize visible light as it is for photocatalytic reactions, and is useful especially for hydrogen generation; and a process for producing the same. The photocatalyst comprises cadmium sulfide, has a capsule structure, wherein platinum is supported thereto. It can be obtainable by bubbling HS gas into a liquid to which particles of cadmium oxide have been added.

Photocatalyst and process for producing the same

An organic layer capable of forming surface areas having an adsorption property different from that of a periphery due to the chemical change of a surface functional group is formed on a board. The surface of the organic layer is patterned and oxidized by a scanning probe microscope to form an array pattern in which small sections for adsorbing nanoparticles are arranged. Then, nanoparticle dispersed solution is applied to the organic layer having the array pattern or the organic layer is dipped in the nanoparticle dispersed solution to form a particle layer on the organic layer. At this time, the nanoparticles in the nanoparticle dispersed solution are respectively fixed only onto the small sections. Therefore, a nanoparticle array on which groups of nanoparticles are arranged in an array can be obtained. Thus, the nanoparticle array on which the groups of the nanoscale particles are arranged on the board is efficiently formed.

Nanoparticle array and method for producing nanoparticle array and magnetic recording medium

Growing community of inventors

Miyagi, Japan

Kazuyuki Tohji