CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY

摘要

The present invention relates to cathode active material for a lithium secondary battery, and more specifically to cathode active material for a lithium secondary battery in which the concentration of the transition metal changes gradually in accordance with particle growth, thus changing the oxidation number of the transition metal and improving the stability of the crystalline structure, and thereby notably improving the high-rate charging and discharging characteristics.

主权项

1. A cathode active material for a lithium secondary battery, wherein the cathode active material contains a nickel-containing lithium transition metal oxide, in which nickel consists of Ni2+ and Ni3+, and in which an oxidation number represented by the following equation has a continuously-increasing gradient in a direction from a center of a particle to a surface of the particle.
m(Ni2+)/{m(Ni2+)+m(Ni3+)} m(Ni3+)/{m(Ni2+)+m(Ni3+)}