METHOD FOR PRODUCING FINE PARTICLE MIXTURE, FINE PARTICLE MIXTURE, LITHIUM ION SECONDARY BATTERY POSITIVE ELECTRODE ACTIVE MATERIAL, LITHIUM ION SECONDARY BATTERY, AND AQUEOUS SOLUTION USED IN METHOD FOR PRODUCING FINE PARTICLE MIXTURE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a fine particle mixture, and the like, the method being capable of continuously synthesizing lithium iron silicate having a small particle diameter and a uniform element distribution at low cost.SOLUTION: A silicon dioxide fine particle is used as a silicon source. Silicon dioxide dissolves in a strong base solution. Lithium hydroxide is therefor used as a lithium source in the present invention. Accordingly, when a silicon dioxide fine particle is mixed into a lithium hydroxide aqueous solution, the silicon dioxide fine particle dissolves into the solution. Divalent iron is preferably used as an iron source.