| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode material of high capacity having a good cycle characteristic, and provide a secondary battery of high reliability having high energy density. SOLUTION: This nonaqueous electrolyte secondary battery is formed by having a negative/positive electrode consisting of carbon material capable of doping/dedoping lithium and a nonaqueous electrolyte dissolving an electrolyte in a nonaqueous solvent. An organic material is formed into a fiber shape, thereafter made infusible, to be heat treated, a carbon material is obtained, and its sectional higher order structure is radial type in the center part and a random radial type in a surface layer part, the negative electrode is constituted. When assuming R for radius of fiber composed of carbon material and L for radius of location forming a radial part concentrically to this fiber, a carbon material fiber with L/R less than 1 is formed, this fiber serves as a negative electrode material. Further, the negative electrode material for the nonaqueous electrolyte secondary battery is used, the nonaqueous electrolyte secondary battery is constituted. |
