Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Umicore

Hydro-quebec

Hitachi, Ltd.

Other

Zeon Corporation

Nippon Hoso' Kyokai

Showa Denko K.k. & Hitachi, Ltd.

Kameyama, Mutsumi

Shishikura, Toshikazu

Murakoshi, Yoshihiko

Takeuchi, Masataka

Konuma, Hiroshi

Posco Chemtech

Masataka Takeuchi

Chiaki Sotowa

Shuichi Naijo

Nobuaki Ishii

Naoko Ito

Koro Shirane

Takashi Ohkubo

Stijn Put

Akinori Sudoh

Yoshiaki Takahashi

Motoaki Kamachi

Koji Tokita

Hirokazu Murata

Karim Zaghib

Abdelbast Guerfi

Yukio Kobayashi

Patrick Charest

Ayako Nishioka

Jun Noguchi

Dirk Van Genechten

Hideo Yashima

Yuuichi Kamijou

Takayuki Fukai

Arihiro Muto

Miyuki Ueda

Takeshi Igarashi

Yasuaki Wakizaka

Toshikazu Shishikura

Hiroshi Konuma

Jan Gilleir

Kazuhiko Ooga

Kris Driesen

Nicolas Marx

Yoshiyuki Nishimura

Eri Tamura

Mutsumi Kameyama

Arihiro Mutoh

Junko Mizuguchi

Takashi Igarashi

Ryusuke Miura

Hiroshi Yasuda

Takeshi Nakamura

Toshiyuki Sakai

Satoshi Narukawa

Masahiro Yamakawa

Shizuo Tokito

Hidenori Nakamura

Yoshiaki Ikenoue

Jong-Sung Kim

Ikuro Nakane

Takanori Fujii

Isao Tanaka

Junji Yotsuyanagi

Hidekazu Mori

Yasunobu Kodama

Motoyuki Hirata

Yvan A Strauven

Mohit Jain

Masako Tanaka

Mitsunori Suzuki

Youji Inoue

Tsutomu Sonozaki

Jin Hu

Manabu Ohira

Yoshihito Yokoyama

Kazuo Teraji

Masaaki Nishioka

Yasunari Otsuka

Nader Marandian Hagh

Jung-Min Han

Masashi Sakaguchi

Jeong-Hun Oh

Chul Youm

Farid Badway

Krista Martin

Toyohiko Takahashi

Yoshikazu Kikuta

Yoshihiko Murakoshi

Shiori Maeda

Sam Siau

Kyung-Hee Han

Akihiro Muto

Mitsunori Suzuku

Powder comprising particles comprising a matrix material and silicon-based domains dispersed in this matrix material, whereby the matrix material is carbon or a material that can be thermally decomposed to carbon, whereby either part of the silicon-based domains are present in the form of agglomerates of silicon-based domains whereby at least 98% of these agglomerates have a maximum size of 3 &#x3bc;m or less, or the silicon-based domains are not at all agglomerated into agglomerates.

Powder, electrode and battery comprising such a powder

A negative electrode material for a lithium ion battery, including silicon-containing particles, artificial graphite particles and a carbonaceous material, wherein at least part of the silicon-containing particles, the artificial graphite particles and the carbonaceous material form composite particles; wherein the silicon-containing particles are silicon particles having a SiOx (0&#x3c;x&#x2264;2) layer on the particle surface, having an oxygen content of 1.0 mass % or more and 18.0 mass % or less, and mainly containing particles having a primary particle diameter of 200 nm or less; wherein the artificial graphite particles are non-flaky artificial graphite particles and have a 50% particle diameter in a volume-based cumulative particle size distribution, D50, of 1.0 &#x3bc;m or more and 15.0 &#x3bc;m or less. Also disclosed is a lithium-ion battery including a negative electrode using the negative electrode material.

Negative electrode material for lithium-ion batteries including non-flaky artificial graphite including silicon-containing particles, artificial graphite particles and carbonaceous material

A production method for a composite of fine particles (A) and carbon particles (B), including the steps of: mixing fine particles (A) formed of a substance comprising at least one kind of Si, Sn, Al, Ge and In; and molten pitch, to obtain a mixture (); pulverizing the mixture () to obtain a pulverized product (); dry-mixing the pulverized product () and carbon particles (B) to obtain a mixture (); and firing the mixture (), followed by pulverization; or including the steps of: adding carbon particles (B) to the mixture (), followed by dry mixing and pulverizing, to obtain a pulverized product (); and firing the pulverized product (), followed by pulverization.

Method for producing composite, and negative electrode material for lithium ion battery

Composite powder for use in an anode of a lithium ion battery, whereby the particles of the composite powder comprise silicon-based domains in a matrix, whereby the individual silicon-based domains are either free silicon-based domains that are not or not completely embedded in the matrix or are fully embedded silicon-based domains that are completely surrounded by the matrix, whereby the percentage of free silicon-based domains is lower than or equal to 4 weight % of the total amount of Si in metallic or oxidized state in the composite powder.

Composite powder for use in an anode of a lithium ion battery, method of preparing such a composite powder and method for analysing such a composite powder

The present invention relates to a negative electrode material for a lithium ion battery, made of a composite material comprising silicon-containing particles, artificial graphite particles and a carbon coating layer, wherein the silicon-containing particles are silicon particles having a SiOx layer (0&#x3c;x&#x2264;2) on a particle surface, have an oxygen content ratio of 1 mass % or more and 18 mass % or less, and mainly comprise particles having a primary particle diameter of 200 nm or less; and the artificial graphite particles have a scale-like shape. By using the negative electrode material, a lithium ion battery having a high capacitance and excellent charge-discharge cycle characteristics can be produced.

Negative electrode material for lithium ion batteries and use thereof

A composite electrode material consisting of a carbon coated complex oxide, fibrous carbon and a binder. Said material is prepared by a method which includes co-grinding an active electrode material and fibrous carbon, and adding a binder to the co-grinded mixture to lower the viscosity of the mixture. The fibrous carbon is preferably vapor grown carbon fibers.

Composite electrode material

A composite carbon particle for use in a negative electrode of a lithium-ion secondary battery, the composite carbon particle including a core particle composed of a carbon material obtained by heating, at not higher than 2500&#xb0; C., petroleum coke having a Hardgrove grindability index (HGI value) of 30 to 60 (defined by ASTM D409), and a covering layer composed of a carbonaceous material obtained by heating an organic compound at 1000&#xb0; C. to 2000&#xb0; C. The composite carbon particle has a 50% particle diameter (D50) of 1 &#x3bc;m to 30 &#x3bc;m in a volume-based cumulative particle size distribution as measured by a laser diffraction method.

Composite carbon particle and lithium-ion secondary cell using same

A negative electrode material for lithium ion batteries is obtained by a method which includes: mixing carbon particles (B) such as graphite particles, particles (A), such as Si particles, containing an element capable of occluding and releasing lithium ions, a carbon precursor such as sucrose, a carboxylic acid compound such as acetic acid, and a liquid medium such as water or isopropyl alcohol to prepare a slurry; drying and solidifying the slurry; and heat-treating the resulting solidified material to carbonize the carbon precursor. A lithium ion battery is obtained using this negative electrode material.

Method for producing negative electrode material for lithium ion batteries

Particles (A) including an element capable of intercalating and deintercalating lithium ions, carbon particles (B) capable of intercalating and deintercalating lithium ions, multi-walled carbon nanotubes (C), carbon nanofibers (D) and optionally electrically conductive carbon particles (E) are mixed in the presence of shear force to obtain a composite electrode material. A lithium ion secondary battery is obtained using the above composite electrode material.

The present invention relates to a lithium battery positive electrode comprising an active substance that can occlude and release lithium ion, a carbon-based conductivity enhancer, and a binder, characterized in that the positive electrode contains the carbon-based conductivity enhancer in an amount of 0.1 to 2 mass % on the basis of the entire mass of the positive electrode, and that the carbon-based conductivity enhancer contains a carbon fiber having a mean fiber diameter of 1 to 200 nm, wherein the active substance that can occlude and release lithium ion is contained in an amount, as calculated from the true density of the active substance, of 70% by volume or more on the basis of the total volume of the positive electrode; and relates to a lithium battery using the a lithium battery positive electrode. The positive electrode obtained by the present invention has an excellent electrolyte permeability and electrolyte retention. Therefore, it is better adapted to high-density lithium battery.

Positive electrode for a lithium battery and lithium battery employing the same

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 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 negative electrode material for a lithium ion battery, in which a fine particle (A) containing an element selected from Si, Sn, Ge and In and a carbon particle (B) obtained by heat-treating a petroleum-based coke and/or a coal-based coke at a temperature of 2,500&#xb0; C. or more are connected through a chemical bond such as urethane bond, urea bond, siloxane bond and ester bond. Also disclosed are a negative electrode sheet obtained by coating a current collector with a paste containing the negative electrode material, a binder and a solvent, and then drying and pressure-forming the paste; and a lithium ion battery incorporating the negative electrode sheet.

Negative electrode material for lithium battery

A method for producing a graphie material for an electrode material for lithium ion batteries, including a step for exothermically graphitizing a carbon material by directly passing an electric current therethrough. The carbon material has an compact powder resistivity of 0.4 &#x3a9;&#xb7;cm or less when compressed to a density of 1.4 g/cm, has an angle of repose in the range of 20&#xb0; to 50&#xb0; inclusive, and has a particle size (D90) in the volume-based particle size distribution measured using laser diffraction of 120 &#x3bc;m or less. The average surface interval (d002) of a surface (002) of the carbon material after graphitization, measured using x-ray diffraction, is in the range of 0.3354 nm-0.3450 nm inclusive.

Method for producing electrode material for lithium ion batteries

The invention relates to an anode for lithium secondary battery comprising vapor grown carbon fiber uniformly dispersed without forming an agglomerate of 10 &#x3bc;m or larger in an anode active material using natural graphite or artificial graphite, which anode is excellent in long cycle life and large current characteristics. Composition used for production for the anode can be produced, for example, by mixing a thickening agent solution containing an anode active material, a thickening agent aqueous solution and styrene butadiene rubber as binder with a composition containing carbon fiber dispersed in a thickening agent with a predetermined viscosity or by mixing an anode active material with vapor grown carbon fiber in dry state and then adding polyvinylidene difluoride thereto.

Method for producing anode for lithium secondary battery and anode composition, and lithium secondary battery

Growing community of inventors

Chiba, Japan

Masataka Takeuchi