Mitsui Mining Co., Ltd.

Nippon Coke & Engineering Company, Limited

Other

Nippon Power Graphite Co., Ltd.

Tatsuo Umeno

Tadanori Tsunawaki

Kenji Fukuda

Youichiro Hara

Yoshinori Yasumoto

Osamu Matsunaga

Takashi Hiruta

Shinya Okabe

Kohei Murayama

Tasuku Saito

Shigeki Endo

Katsusuke Iwanaga

Jyugo Sumitomo

Takashi Iwao

Shigeyosi Nakano

Koutarou Mizuma

Howard See

Shirou Oie

Shiroh Oie

Koji Sakata

An apparatus for manufacturing a lithium-ion secondary cell negative-electrode carbon material by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus having a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles into the interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior and a cooling tank connected in an airtight manner to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means.

Apparatus for manufacturing negative-electrode carbon material, and method for manufacturing negative-electrode carbon material using same

A negative electrode material for lithium ion secondary batteries comprises amorphous coated particles that are composed of a plurality of consolidated particles having no specific shape, said consolidated particles being obtained by consolidating a plurality of primary spheroidized graphite particles, and 0.5-20% by mass of an amorphous carbon layer that covers the surfaces of the consolidated particles and binds the consolidated particles with each other; and 0.5-20% by mass of a highly crystalline carbon layer that is formed so as to cover the outer surfaces of the amorphous coated particles and has an interplanar distance ascribed to CVD processing of 0.335 nm or more but less than 0.3369 nm. The negative electrode material for lithium ion secondary batteries is also characterized by having a porosity of 5% by volume or less, and a method for producing the negative electrode material for lithium ion secondary batteries.

Negative electrode material for lithium ion secondary batteries, and method for producing same

The present invention relates to a graphite particle and a carbon-graphite composite particle both suitable for use in electrode for lithium ion secondary battery, as well as to processes for producing these particles. The graphite particle of the present invention has an average particle diameter of 5 to 50 &#x3bc;m, wherein one or more recesses having a depth of 0.1 to 10 &#x3bc;m are formed in the surface. The graphite particle is produced by a mixing step for mixing raw material graphite particles and recess-forming particles, a press molding step for press-molding the mixture composed of the raw material graphite particles and the recess-forming particles to obtain a molded article, a pulverization step for pulverizing the molded article, and a separation step for separating and removing the recess-forming particles from the pulverized molded article. The carbon-graphite composite particle of the present invention is produced by performing a thermal CVD step which comprises covering the surface of the above-mentioned graphite particle with a carbon layer.

Graphite particle, carbon-graphite composite particle and their production processes

Graphite particles having a bent laminate structure inside each particle are produced by feeding, into an impact grinder, graphite particles having an average particle diameter of 5 mm or less together with a gas current to apply an impact to the graphite particles to form, by a compression force, a bent laminate structure inside each graphite particle. The resulting graphite particles have an average particle diameter of 100 &#x3bc;m or less, are low in anisotropy, have a nearly spherical shape, and are highly crystalline.

Graphite particles and process for production thereof

An anode material for lithium secondary battery, which comprises graphite particles and a crystalline carbon coating layer formed thereon, wherein each graphite particle has a bent laminate structure inside, is produced by grinding a graphite of 5 mm or less in average particle diameter using an impact grinder to produce graphite particles of 100 &#x3bc;m or less in average particle diameter having a bent laminate structure inside each particle and then subjecting the graphite particles to chemical vapor deposition in a fluidized bed type reaction furnace to form a crystalline carbon coating layer on the graphite particles.

Anode material for lithium secondary battery, process for production thereof, and lithium secondary battery

The present invention can provide particles for electro-rheological fluid for providing a high electro-rheological effect over a wide temperature range at low electric power consumption, and having high strength and excellent durability, not being susceptible to break-up due to the load of stress. Particles for an electro-rheological fluid of the present invention comprise spherical carbonaceous particles, obtained substantially from a solvent and a condensation product of a methylene type bond of aromatic sulfonic acid or a salt thereof.

Particles for electro-rheological fluid

Composite material for anode of lithium secondary battery, and lithium secondary battery

The present invention discloses an anode material for lithium secondary battery, comprising a particulate core composed of a metal or semimetal capable of forming a lithium alloy and a carbon layer covering the surface of the particulate core; a lithium secondary battery using said anode material; and a method for discharging of said secondary battery.

Anode material for lithium secondary battery, lithium secondary battery using said anode material, and method for charging of said secondary battery

Growing community of inventors

Fukuoka, Japan

Tatsuo Umeno