METHOD FOR PRODUCTION OF CATHODE ACTIVE MATERIAL FOR LITHIUM ION BATTERY, CATHODE ACTIVE MATERIAL FOR LITHIUM ION BATTERY PRODUCED BY THE METHOD, ELECTRODE FOR LITHIUM ION BATTERY, AND LITHIUM ION BATTERY

摘要

A method for producing a cathode active material for lithium ion batteries includes a step of synthesizing LiFePO 4 by carrying out a hydrothermal reaction using an Li salt, a Fe salt, and a phosphoric acid source as raw materials. Elements Li and Fe in the Li and Fe salts are added to the reaction system in amounts excessively larger than the theoretical amounts required for the hydrothermal reaction. The synthesized LiFePO 4 has an average primary particle size of equal to or larger than 30 nm and equal to or smaller than 100 nm.