COMPOSITE MATERIAL FOR CATHODE ACTIVE MATERIAL AND ITS MANUFACTURING METHOD

Abstract

An example of the disclosure provides a composite material for a cathode active material and a method for manufacturing the same. A lithium secondary battery, including a high nickel cathode active material (NCM) and a composite material for a cathode active material in which the cathode active material surface is made of a lithium active material (positive electrode coating material), of the disclosure has the effect of improving the overall energy density by compensating for lithium consumed for forming a Solid Electrolyte Interface (SEI) layer of a negative electrode during an initial charge reaction, and suppressing side reactions occurring between an electrolyte and the cathode active material surface through a change to a stable rock-salt crystal structure of a positive electrode coating layer.

CPC Classifications