PREPARATION METHOD OF LITHIUM IRON PHOSPHATE POWDERS FOR CATHODE MATERIAL IN LITHIUM SECONDARY BATTERY BY SOLID STATE SYNTHESIS

摘要

PURPOSE: A method for preparing lithium iron phosphate powders is provided to reduce manufacturing costs using an inexpensive starting material and to obtain minute and uniform powder particles. CONSTITUTION: A method for preparing lithium iron phosphate powders includes the steps of: mixing two or more starting materials selected from Li2CO3, FeC2O42H2O, (NH4)H2PO4, (NH4)2HPO4, and LiH2PO4; grinding and mixing the mixture through a ball mill method; drying the mixture; heat-treating the dried powder; carbon coating the heated material; and heat-treating a product of the above step.