POSITIVE ELECTRODE ACTIVE MATERIAL OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, ITS MANUFACTURING METHOD, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING POSITIVE ELECTRODE ACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method for a positive electrolyte secondary battery of a nonaqueous electrolyte secondary battery capable of improving industrial mass productivity without spoiling battery performance.

SOLUTION: In a process of calcining a mixture obtained by mixing a nickel complex compound having an average particle diameter of 8-20 μm, and a lithium compound and having bulk density of 1.0-2.2 g/ml by filling up in a calcination container, when thickness at the time of inserting the mixture into the calcination container is set up to be t (mm), a time for retaining temperature of the mixture at a temperature range of 550-650°C is set up to be the minimum retention time or more calculated from formula of time (minute) equal to 0.026t2-2.7. Upon performing calcination in an acid atmosphere where oxygen concentration is 60 vol.% or more, the positive electrode active material made from lithium-nickel complex oxide can be attained by washing the attained calcined object with water.

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