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

摘要

PROBLEM TO BE SOLVED: To improve high-temperature characteristics when a lithium transition metal oxide is used as an active substance. SOLUTION: This positive electrode material for the lithium secondary battery includes, as an active material, lithium transition metal oxide and contains a chalcogen compound of yttrium and/or a chalcogen compound of a lanthanoid element.