METHOD FOR REDUCING AMOUNT OF LITHIUM REMAINING IN POSITIVE ELECTRODE ACTIVE MATERIAL PARTICLES

摘要

PROBLEM TO BE SOLVED: To provide a method for reducing an amount of lithium remaining in positive electrode active material particles in a simple and efficient manner while suppressing the rise in the production cost.SOLUTION: A method for reducing an amount of lithium remaining in positive electrode active material particles made of a lithium composite oxide comprises at least the step of setting a baking temperature at a temperature of 850°C or higher, and keeping the set baking temperature and an ambient atmosphere for a given time and then, switching an atmosphere while the set baking temperature is lowered, from the ambient atmosphere to a low-carbon dioxide gas atmosphere of which the carbon dioxide concentration is no more than 1/60 of a carbon dioxide concentration of the ambient atmosphere, and baking a mixture of a precursor compound including Ni, Co and Mn, and a lithium compound, thereby preparing a lithium composite oxide.SELECTED DRAWING: None