| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a positive electrode active material for a secondary battery having high energy density and excellent repetitive charge-discharge performance and to provide a secondary battery using it. SOLUTION: This secondary battery uses a positive electrode active material Lix Mna Nib Coc O2 obtained by heat-treating a mixture comprising a trivalent transition metal compound in a temperature range of 950-1100 deg.C, (where, a, b and c should be positioned in a range shown by a region surrounded by lines connecting four points comprising a point A (a, b, c)=(0.5, 0.5, 0), a point B (0.45, 0.55, 0), a point C (0.25, 0.35, 0.4) and a point D (0.3, 0.3, 0.4) on a ternary state diagram expressing the relationship thereof, and X should be 0.95<=x/(a+b+c)<=1.05). |
