| 摘要 |
PURPOSE:To improve the cycling characteristic and self-discharge characteristic by combining coke as a negative electrode material in a specific range of the specific surface area by BET equation. CONSTITUTION:Coke used as a negative electrode active material has solid carbon at least 90% or more, and its specific surface area A (m<2>/g) by BET equation is larger than 0.1 and less than 100. If the n-doping agent of coke is used as a stable electrode, values of the crystal thickness Lc(Angstrom ) and true density rho(g/cm<2>) are very important, and the values of the crystal thickness Lc(Angstrom ) and true density rho(g/cm<2>) are set in the range: 1.70 <rho< 2.18 and 10<Lc<120rho-189. Thereby, the cycling characteristic and self-discharge characteristic are improved. |
