Patent ID: 8101143

Claim:
A process for producing a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, said lithium-containing composite oxide being represented by the formula Li p Co x M m O 2 (wherein M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9≦p≦1.2, 0.97≦x≦1.00, 0≦m≦0.03, and x+m=1, which comprises using as an M element source a solution comprising a complex containing the M element dissolved in an organic solvent, wherein the solution having a complex containing the M element dissolved in an organic solvent and a Co source compound powder are mixed, the organic solvent is removed from the obtained mixture, the mixture is mixed with a lithium source compound powder, and the resulting mixture is fired at from 900 to 1,050° C. in an oxygen-containing atmosphere, and wherein the complex containing the M element a complex of diethylene glycol and triethylene glycol of a nitrate of the M element, and the organic solvent is a polar organic solvent.