| 摘要 |
PURPOSE: To provide carbon fibers with high charge/discharge capacity and high energy density by piling up graphite layers in a roofing tile state and forming composition orientation in which gaps for going in and out of lithium are formed between the roofing tile state edges in the surface layer of a carbon fiber. CONSTITUTION: A meso-phase pitch carbon fiber for a secondary battery negative electrode material has highly flexed graphite layer surface structure on the inside of the fiber. On the surface of the fiber, the fiber has orientation structure in which graphite layers spread in a roofing tile state in the circumferential direction and are piled up each other, and gaps for going in and out of lithium are formed between the roofing tile state edges. The carbon fiber is preferable to have an aspect ratio of 1-20 and to be a milled carbon fiber whose coefficient of variation of diameter is 10-50%. The carbon fiber is obtained by spinning meso-phase pitch, conducting infusible treatment, and carbonizing. |
