| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode material of high capacity having a good cycle characteristic and a secondary battery of high reliability having high energy density. SOLUTION: In a nonaqueous electrolyte secondary battery having a negative/positive electrode formed of a carbon material capable of doping/dedoping lithium and a nonaqueous electrolyte formed by dissolving an electrolyte in a nonaqueous solvent, the negative electrode material is formed by crushing precursor graphitized fiber 20 having a different crystal part 21 periodically in a fiber lengthwise direction, a fiber-shaped carbon material has 50 or less aspect ratio and 1.5m<2> /g or less specific surface area by a BET method. The negative electrode material, after forming an organic material in a fiber shape, is made infusible, the carbon material is formed by heat treating. In the case of forming the organic material into a fiber shape, it is formed while applying a magnetic field in a pulse shape to a delivery spinning delivery hole or while applying an ultrasonic vibration to the delivery spinning delivery hole. The nonaqueous electrolyte secondary battery is constituted by using this negative electrode material. |
