METHOD OF PRODUCING PARTICULATE MIXTURE, PARTICULATE MIXTURE, LITHIUM ION SECONDARY BATTERY POSITIVE ELECTRODE ACTIVE MATERIAL, LITHIUM ION SECONDARY BATTERY, AND AQUEOUS SOLUTION USED IN METHOD OF PRODUCING THE PARTICULATE MIXTURE

摘要

PROBLEM TO BE SOLVED: To provide a method and the like of producing a particulate mixture capable of continuously synthesizing lithium iron phosphate having small particle diameter and uniform element distribution at low cost.SOLUTION: Preferably, a divalent iron chloride, which is a divalent iron, is used for an iron source. A phosphorous acid is used for a phosphorus source. The phosphorous acid has strong reduction characteristics. When a divalent iron is oxidized to a trivalent iron, it might precipitate hydroxides. Therefore, the phosphorous acid is applied to control progress of oxidation of iron. That is, the phosphorous acid serves as the phosphorus source and functions as an antioxidant for iron. For a lithium source, a lithium hydroxide is desirable because it is inexpensive and includes no corrosive substance such as chlorides.