FERRIC PHOSPHATE HYDRATE PARTICLE POWDER AND METHOD FOR PRODUCING THE SAME, OLIVINE-TYPE LITHIUM IRON PHOSPHATE PARTICLE POWDER AND METHOD FOR PRODUCING THE SAME, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a ferric phosphate hydrate particle powder which can be used suitably as a precursor of an olivine-type lithium iron phosphate particle powder for use in a positive electrode active material for a non-aqueous electrolyte secondary battery, is very fine, and contains impurities in an extremely small amount.

SOLUTION: Disclosed is a ferric phosphate hydrate particle powder which is a precursor of an olivine-type lithium iron phosphate particle powder, and is characterized by having at least one crystal structure selected from a strengite structure and a metastrengite structure, an Na content of 100 ppm or less and a phosphorus/iron mole ratio of 0.9 to 1.1.

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