| 摘要 |
PROBLEM TO BE SOLVED: To provide a mixed active material capable of simultaneously achieving single electrode electrochemical characteristics and filling property (low porosity) at the positive electrode of a lithium secondary battery by mixing a "lithium excessive type" active material with a "LiMeOtype" active material, a positive electrode using the mixed active material, and a lithium secondary battery including the positive electrode.SOLUTION: The mixed active material for the lithium secondary battery, prepared by mixing a lithium excessive type lithium transition metal composite oxide (1<Li/Me 1<1.5, Mn/Me 1>0.5) and LiMe2O(0<Mn/Me 2≤0.5) including Co, Ni, and Mn as transition metals Me 1 and Me 2, is characterized in that 50 to 85 mass% of the lithium excessive type lithium transition metal composite oxide is contained in the mixed active material, the average particle size of the lithium excessive type lithium transition metal composite oxide is smaller than that of LiMe2O, and a peak differential pore volume is equal to or more than 0.85 mm/(g nm).SELECTED DRAWING: None |
