CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY AND METHOD FOR PREPARING THEREOF AND LITHIUM SECONDARY BATTERY CONTAINING THE SAME FOR CATHODE

摘要

PURPOSE: A method for preparing a cathode active material for a lithium secondary battery is provided to prevent performance degradation at high pressure and high efficiency by coating the surface of the cathode active material with NH4PF6. CONSTITUTION: A method for preparing a cathode active material for a lithium secondary battery comprises the steps of: preparing NH4PF6 coating solution by mixing NH4PF6 into a polar solvent; adding a cathode active material to the NH4PF6 coating solution and reacting them; and generating a cathode active material coated with NH4PF6.