| abstract |
A process for producing a lithium-containing composite oxide for the positive electrode of a lithium secondary cell, the composite oxide having a high volumetric capacitance density and high safety and excellent in durability in charge/discharge cycles and low-temperature characteristics. The process is for producing a lithium-containing composite oxide represented by the general 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 transition metals other than the N elements, Al, and alkaline earth metals; and 0.9≤p≤1.2, 0.95≤x<2.00, 0<y≤0.05, 1.9≤z≤4.2, and 0≤a≤0.05). It comprises burning a mixture comprising a lithium source, an N-element source, and an M-element source and optionally containing a fluorine source. The mixture comprises granules obtained by mixing an aqueous solution of the M-element source with the N-element source in a powdered or pulverized form to prepare a slurry and drying/granulating the slurry optionally after pulverization and a powder of the lithium source and optionally contains a powder of the fluorine source. It is burned at 700-1,100°C in an oxygenous atmosphere. |