| 摘要 |
PURPOSE:To provide a small, lightweight secondary battery of high performance and high energy density which is excellent in battery performance, especially a cycle characteristic and a self-discharge characteristic. CONSTITUTION:A secondary battery having at least a positive electrode, a negative electrode, a separator and organic electrolyte. The active material of the negative electrode is a carbonaceous material having a BET method specific surface area A(m<2>/g) in the range 0.1<A<100 and values of crystal thickness Lc(Angstrom ) and true density rho(g/cm<3>) at X-ray diffraction within the range that meets the following requirements: 1.80<rho<2.18, 15<Lc, and 120rho-227<Lc<120rho-189; also, the grain size distribution of the carbonaceous material is D(25%)=1.0mu to 8.0mu, D(50%)=3.0mu to 20mu, and D(75%)=5.0mu to 30mu. |
