| 摘要 |
PROBLEM TO BE SOLVED: To allow the use in a broad voltage range, to enhance battery capacity under a high current density and to improve charge/discharge cycle durability by including a lithium transition metal composite oxide having a specific composition as a main component in a positive electrode active material. SOLUTION: A lithium transition metal composite oxide has a lamellar rock salt monoclinic structure and contains a composite oxide expressed by the formula LixMnyM1-yO2, a composite oxide expressed by the formula LixCo1-h-iNihQiO2 and one or more kinds of components selected from a composite oxide expressed by the formula LixCo1-jQjO2, where Q and (x) are independently selected among each of the formulas; M is one or more kinds of elements selected from Al, Fe, Co, Ni and Cr; Q is one or more kinds of elements selected from Al, Fe, Mn, Ti, Ca And Mg; 0<x<=q1.1; 0.5<=y<=1; 0.6<=h<=1.0; 0<=i<=0.10; 0<=1-h-i; and 0<=j<=0.05. |
