Patent ID: 8562857

Claim:
A process of producing positive electrode active material particles for a battery, comprising a step of providing a slurry comprising resin particles, a cationic surfactant and/or a polyvinyl alcohol derivative, lithium complex oxide particles, and a polar solvent; removing the polar solvent from the slurry to give a composition; and firing the composition and at the same time, removing the resin particles from the composition, wherein the cationic surfactant is a quaternary ammonium salt, the polyvinyl alcohol derivative is a polyvinyl alcohol into which a quaternary ammonium salt group has been introduced or which has been substituted by a quaternary ammonium salt group, and the resin particles have an average particle size of 0.1 to 20μm; wherein the process further comprises: Step 1 of providing the resin particles obtained by emulsion polymerization or suspension polymerization of an ethylenically unsaturated monomer in the presence of the cationic surfactant and/or the polyvinyl alcohol derivative in a polar solvent 1 and preparing a slurry A containing the resin particles, the cationic surfactant and/or the polyvinyl alcohol derivative, and the polar solvent 1, Step 2 of obtaining a slurry C by mixing the lithium complex oxide particles and the slurry A or by mixing a slurry B containing the lithium complex oxide particles and a polar solvent 2 and the slurry A, Step 3 of obtaining a composition containing the resin particles, the cationic surfactant and/or the polyvinyl alcohol derivative, and the lithium complex oxide particles by removing the polar solvent 1 or the polar solvents 1 and 2 from the slurry C, and Step 4 of obtaining a sintered lithium complex oxide by firing the composition and at the same time, removing the resin particles from the composition, wherein the slurry A practically comprises the resin particles, the cationic surfactant and/or the polyvinyl alcohol derivative, and the polar solvent 1, the slurry B practically comprises the lithium complex oxide particles and the polar solvent 2, and the slurry C practically comprises the slurry A and the lithium complex oxide particles or the slurry B.