PRODUCTION METHOD OF LITHIUM TITANATE POWDER, AND LITHIUM ION SECONDARY BATTERY AND LITHIUM ION CAPACITOR USING THE LITHIUM TITANATE POWDER

摘要

PROBLEM TO BE SOLVED: To provide a lithium titanate powder active material that can maintain electric capacitance at rapid electric charge and discharge.SOLUTION: A production method of a lithium titanate powder is characterized in that a titanium raw material chosen from a titanic oxide, metatitanic acid, orthotitanic acid or a mixture of them and having a BET specific surface area of at least 5 m/g, and a lithium raw material that includes a lithium hydroxide and lithium carbonate, and in which a mixing ratio of the lithium hydroxide to the lithium carbonate that is the lithium hydroxide:the lithium carbonate is 95:5-10:90 in terms of a Li molar ratio when the sum Li amount of the lithium hydroxide and the lithium carbonate is 100, are mixed, then burned, where an average particle diameter of the lithium carbonate before burning is at most 1.0 m.