| 摘要 |
PROBLEM TO BE SOLVED: To improve the energy density per unit volume and prevent occurrence of short circuit and ignition by utilizing as a negative electrode active material a material produced by coating the surface of a carbon based material, to and from which lithium is intercalated and released, with a specified oxide. SOLUTION: In a secondary battery containing a non-aqueous electrolytic solution, a material produced by coating the surface of a carbon-based material, to and from which lithium is intercalated and released, with an oxide containing one or more elements selected from Li, Ge, Sn, Pb, Sb, Bi, B, Al, Si, and In is used as a negative electrode active material. As the carbon based material, to and from which lithium is intercalated and released, natural graphite, artificial graphite, pitch coke, hollow carbon molecule, amorphous carbon, etc., may be usable. By using this battery, a system can be made compact. A battery in which short circuiting due to dendrite hardly occurs and which has a long life and high safeness is thus obtained. |
