Patent ID: 6884543

Claim:
A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode contains: (a) a manganese-contained complex oxide containing: (i) lithium (Li); (ii) manganese (Mn); (iii) a first element (Ma) selected from the group consisting of zinc (Zn), cobalt (Co), aluminum (Al), tin (Sn), chromium (Cr), and magnesium (Mg), wherein the chemical formula of the manganese-contained complex oxide is Li x Mn 2-y Ma y O 4 and wherein x is the range of 0.9≦x≦2.0 and y is in the range of 0.01≦y≦0.50, both inclusive; and (b) a nickel-contained complex oxide containing: (i) lithium (Li); (ii) nickel (Ni); (iii) a second element selected from the group consisting of iron (Fe), zinc (Zn), cobalt (Co), aluminum (Al), tin (Sn), chromium (Cr), and magnesium (Mg), wherein the chemical formula of the nickel-contained complex oxide is LiNi 1-z Ma z O 2 and wherein z is the range of 0.01≦z≦0.50, both inclusive.