Mitsui Mining Co., Ltd.

Kohei Murayama

Kenji Fukuda

Tatsuo Umeno

Tadanori Tsunawaki

Youichiro Hara

Yoshinori Yasumoto

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.

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Fukuoka, Japan

Kohei Murayama