| 摘要 |
The present invention provides a positive electrode active material containing a composite oxide having a composition represented by a structural formula (1) given below: Li x(N1 1-y Me1y)(O2-z X z) + A ... (1) where Me1 is at least one kind of an element selected from the group consisting of B, Mg, A1, Sc, Ti, V, Cr, Mn, Co, Cu, Zn, Ga, Y, Zr, Nb, Mo, Tc, Ru, Sn, La, Hf, Ta, W, Re, Pb and Bi, X is at least one kind of a halogen element selected from the group consisting of F, Cl, Br and I, the molar ratios x, y, z are 0.02 ~ x ~ 1.3, 0.005 ~ y ~ 0.5, and 0.01 ~ z ~ 0.5, A contains at least one element selected from the group consisting of Na, K and S, and each of the Na content, the K content and the S content of the composite oxide falls within a range of between 600 ppm and 3,000 ppm. |
