| 摘要 |
A graphite material for use in a negative electrode of a lithium-ion secondary battery, comprising a graphite material obtainable by solidifying a homogeneous molten mixture composed of a molten pitch and a boric compound to thereby obtain a solid material, carbonizing the solid material, pulverizing the carbonized material and graphitizing the pulverized material, this graphite material having a specified magnetic susceptibility. This graphite material can be produced at lowered cost and can provide a negative electrode which enables producing a lithium-ion secondary battery being excellent in charge and discharge characteristics such as discharge capacity, initial charge and discharge efficiency and repeated charge and discharge performance. Moreover, when this graphite material is milled graphite fibers produced from a fibrous material (pitch fiber) obtained by spinning the above homogeneous molten mixture, a negative electrode material having an internal texture especially suitable for occlusion of lithium ions, such that graphite layer plane are exposed on the particle surface and graphite layers are oriented in a circumferential direction, can be provided. |
