Process for producing lithium-cobalt composite oxide

摘要

A mixture of a cobalt compound and a lithium compound is calcined at a temperature of 250 DEG C. to 1,000 DEG C., where said cobalt compound has a cobalt content of 68.5+/-6% by weight, its composition is substantially represented by a formula HxCoOy provided that 0/=7.5-0.1x(Cobalt content) (% by weight). This provides an inexpensive and simple process for producing a lithium-cobalt composite oxide having uniform crystals, and a high-performance electrode active material for use in lithium secondary cells in high capacity and excellent in the charging-discharging cycle characteristics.