Hitachi Chemical Company, Ltd.

Keiji Okabe

Yoshito Ishii

Nobushige Nakamura

Yuriko Ida

Hidetoshi Honbou

Teppei Takahashi

An anode material for a lithium ion secondary battery that includes a carbon material having an average interlayer spacing das determined by X-ray diffraction of from 0.335 nm to 0.340 nm, a volume average particle diameter (50% D) of from 1 &#x3bc;m to 40 &#x3bc;m, a maximum particle diameter Dof 74 &#x3bc;m or less, and at least two exothermic peaks within a temperature range of from 300&#xb0; C. to 1000&#xb0; C. in a differential thermal analysis in an air stream.

Anode material for lithium ion secondary battery, anode for lithium ion secondary battery, and lithium ion secondary battery

Disclosed are carbon particles for a negative electrode of a lithium ion secondary battery, the carbon particles having a pore volume of pores having a size of 2&#xd7;10 to 2&#xd7;10&#x212b;, of 0.1 ml/g or less with respect to the mass of the carbon particles; having an interlayer distance d(002) of a graphite crystal as determined by an X-ray diffraction analysis, of 3.38 &#x212b; or less; having a crystallite size Lc in the C-axis direction of 500 &#x212b; or more; and having a degree of circularity of the particle cross-section in the range of 0.6 to 0.9. Therefore, the carbon particles for the negative electrode of the lithium ion secondary battery enables to have high capacity and have superior rapid charge characteristics, a negative electrode for a lithium ion secondary battery using the carbon particles, and a lithium ion secondary battery can be provided.

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Hitachi, Japan

Keiji Okabe