METHOD FOR PRODUCING FINE PARTICLE, METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, POSITIVE ELECTRODE ACTIVE MATERIAL, LITHIUM ION SECONDARY BATTERY USING POSITIVE ELECTRODE ACTIVE MATERIAL, AND RAW MATERIAL EMULSION FOR PRODUCING FINE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide: a method for producing nanoparticles having small particle diameters at low cost by means of a spray combustion method; and the like.SOLUTION: A method for producing fine particles includes the steps of: spraying, in a droplet form, a raw material emulsion 13 that is a water-in-oil emulsion including a raw material solution dispersed as droplets, the raw material solution containing silicon-containing fine particles and lithium ions as well as raw material metal ions other than lithium and silicon, in a combustible liquid; and firing the combustible liquid in droplets 21 to form fine particles 27. The raw material emulsion 13 may contain a surfactant.