Importance

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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: I: a composite oxide possessing a layer structure and represented by the general formula: A.sub.x M.sub.y N.sub.2 O.sub.2 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, 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, .rho., both having the values falling in a specific range. The secondary battery of this invention is small and light, excels in cyclicity and self-discharging property, and possesses a high energy density.

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First Claim