| abstract |
PROBLEM TO BE SOLVED: To improve cycle characteristics and low temperature load characteristics of a nonaqueous electrolyte secondary battery. A non-aqueous electrolyte secondary battery includes a positive electrode 2 and a negative electrode 3 that are electrochemically doped and dedoped with lithium, and an electrolyte interposed between the positive electrode 2 and the negative electrode 3. The positive electrode 2 is represented by the general formula Li t CoM s O 2 (wherein M is a metal, 0 ≦ s ≦ 0.03, 0.05 ≦ t ≦ 1.15). a cathode active material, the general formula Li x Ni (1-yz) Co y Mn z A a O 2 ( where, A is a metal, 0.05 ≦ x ≦ 1.15,0.15 ≦ y + z ≦ 0.70, 0.05 ≦ z ≦ 0.40, 0 ≦ a ≦ 0.10.) Containing a second positive electrode active material represented by the following formula: [Selection] Figure 1 |