Nippon Coke & Engineering Company, Limited

Nippon Power Graphite Co., Ltd.

Shinya Okabe

Tatsuo Umeno

Tadanori Tsunawaki

Jyugo Sumitomo

Shigeyosi Nakano

Koutarou Mizuma

Shirou Oie

Shiroh Oie

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

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Fukuoka, Japan

Shinya Okabe