| 摘要 |
PURPOSE: A nonaqueous electrolyte secondary battery is provided, to improve capacity, thermal stability at a high temperature, storage property and high rate discharge property. CONSTITUTION: The nonaqueous electrolyte secondary battery comprises a positive electrode; a negative electrode; and a nonaqueous electrolyte solution, wherein a positive electrode active material is a mixture of a lithium manganese composite oxide and at least one selected from the group consisting of a lithium nickel composite oxide represented by LiNi_a M1_1-a O2 (wherein M1 is at least one element selected from the group consisting of B, Mg, Al, Ti, Mn, V, Fe, Co, Cu, Zn, Ga, Y, Zr, Nb, Mo and In, and 0<a<=1) and a lithium cobalt composite oxide represented by LiCo_b M2_1-b O2 (wherein M2 is at least one element selected from the group consisting of B, Mg, Al, Ti, Mn, V, Fe, Co, Cu, Zn, Ga, Y, Zr, Nb, Mo and In, and 0<b<=1); and the nonaqueous electrolyte solution contains a saturated cyclic carbonic ester and an unsaturated cyclic carbonic acid ester having a carbon double bond, and the content of the unsaturated cyclic carbonic acid ester is 1.0x10¬-8 to 2.4x10¬-4 g per positive electrode capacity 1 mAh. |
