A process for preparing a lithium containing komposiittioksidin

To provide a process for a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and is excellent in the charge and discharge cyclic durability and low temperature characteristics. A process for producing a lithium-containing composite oxide represented by the formula LipNxMyOzFa (wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than N, 0.9@p@1.2, 0.95@x@2.00, 0pulverized product to form a slurry; if necessary after being pulverized, the slurry is dried for granulation to obtain a granulated product, which is mixed with a lithium source powder and if necessary, a fluorine source powder to obtain a mixture; and the mixture is fired at from 700 to 1,100° C. in an oxygen-containing atmosphere.