POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY

摘要

A positive electrode active material for a lithium secondary battery includes a primary particle containing a spinel phase and a layered rock-salt phase. The spinel phase is formed of a nickel-and-manganese-containing composite oxide having a spinel crystal structure that includes lithium, nickel, and manganese. The layered rock-salt phase is formed of a transition metal composite oxide having a layered rock-salt crystal structure that includes lithium and at least one transition metal element. The nickel-and-manganese-containing composite oxide contains oxygen and fluorine. The transition metal composite oxide includes oxygen and fluorine.

主权项

1. A positive electrode active material for a lithium secondary battery, the positive electrode active material comprising
a primary particle including a spinel phase and a layered rock-salt phase, wherein the spinel phase is formed of a nickel-and-manganese-containing composite oxide having a spinel crystal structure that includes lithium, nickel, and manganese, the layered rock-salt phase is formed of a transition metal composite oxide having a layered rock-salt crystal structure that includes lithium and at least one transition metal element, the nickel-and-manganese-containing composite oxide contains oxygen and fluorine, and the transition metal composite oxide includes oxygen and fluorine.