The manufacturing process of cathode materials for lithium-ion secondary batteries includes a grinding process that finely crushes the condensed reactants to the desired particle size. At this time, the grinding process utilizes a mechanical impact method that occurs between a grinding track installed circumferentially inside the equipment and a high-speed rotating rotor. Previously, metal products were used inside the classifying mill, but the high wear rate of the metal itself and the resulting contamination resulted in significant problems. Therefore, there is a new trend to use ceramic (Al2O3, ZrO2) products with high wear resistance characteristics.