| abstract |
This invention provides a secondary battery in a nonaqueous type using a substance indicated in I below and/or a substance indicated in II below as an active material for either of positive and negative electrodes: n I: a composite oxide possessing a layer structure and represented by the general formula: n n A.sub.x M.sub.y N.sub.2 O.sub.2 n n wherein A stands for at least one alkali metal, M for a transition metal, N for at least one member selected from the group consisting of Al, In, and Sn, and x, y, and z respectively for the number falling in a specific range, n II: an n-doped carbonaceous material which has a BET-method specific surface area, and a crystal thickness, Lc, in the X-ray diffraction and a true density, ρ, both having the values falling in a specific range. n The secondary battery of this invention is small and light, excels in cyclicity and self-discharging property, and possesses a high energy density. |