LITHIUM-CONTAINING COMPOSITE OXIDE AND NONAQUEOUS SECONDARY CELL USING THE SAME, AND METHOD FOR MANUFACTURING THE SAME

Because of the composition represented by General Formula: Li1+x+ alpha Ni(1-x-y+ delta )/2Mn(1-x-y- delta )/2MyO2 (where 0 ≤ x ≤ 0.05, -0.05 ≤ x+ alpha ≤ 0.05, 0 ≤ y ≤ 0.4; -0.1 ≤ delta ≤ 0.1 (when 0 ≤ y ≤ 0.2) or -0.24 ≤ delta ≤ 0.24 (when 0.2 < y ≤ 0.4); and M is at least one element selected from the group consisting of Ti, Cr, Fe, Co, Cu, Zn, Al, Ge and Sn), a high-density lithium-containing complex oxide with high stability of a layered crystal structure and excellent reversibility of charging/discharging can be provided, and a high-capacity non-aqueous secondary battery excellent in durability is realized by using such an oxide for a positive electrode.