Patent ID: 6872491
Filing Date: 2005-03-29
Classification: H01M,Y02E,Y02P

Abstract:
1. A lithium ion secondary battery, comprising: a positive electrode comprising an active material containing a composite oxide; a negative electrode; and a nonaqueous electrolyte; the composite oxide having a composition represented by a structural formula (1) given below: where Me1 is at least one kind of an element selected from the group consisting of B, Mg, Al, 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 Ca and 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 from 600 ppm to 3,000 ppm, and the Ca content in said composite oxide is not higher than 550 ppm.