MANUFACTURING METHOD OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, POSITIVE ELECTRODE ACTIVE MATERIAL, AND LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a cathode active material for a lithium secondary battery, in which a dissolution amount of a metal in a positive electrode active material composed of an olivine type M lithium phosphate (M is a bivalent metal) into an electrolytic solution can be reduced and a lithium secondary battery having a long time stability and a high discharging capacity can be manufactured.

SOLUTION: A raw material of a powder of an olivine type M lithium phosphate (M is a bivalent metal) having an average particle diameter of a primary particle less than 1 micron is sintered in a vacuum or an inert atmosphere and the obtained sintered body is pulverized. A positive electrode active material powder for the lithium secondary battery composed of the olivine type M lithium phosphate manufactured in the above manufacturing method or a positive electrode active material powder composed of a complex body between the above powder and a carbon source is used for a positive electrode of the lithium secondary battery.

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