Patent ID: 8298707

Claim:
A nonaqueous electrolyte secondary battery comprising: a cathode including a positive active material; an anode including a negative active material; and a nonaqueous electrolyte, wherein, the positive active material includes a compound expressed by a general formula Li m ,M x M′ y M″ z O 2 , where M designates at least one kind of element selected from Co, Ni and Mn, M′ designates at least one kind of element selected from Al, Cr, V, Fe, Cu, Zn, Sn, Ti, Mg, Sr, B, Ga, In, Si and Ge, and M″ designates at least one kind of element selected from Mg, Ca, B and Ga, x is designated by an expression of 0.9≦x<1, y is indicated by an expression of 0.001≦y≦0.5, z is indicated by an expression of 0≦z≦0.5, and m is indicated by an expression of 0.5≦m, the positive active material includes lithium manganese oxide expressed by a general formula Li s Mn 2-t Ma t O 4 , where s is designated by an expression of 0.9≦s, the value of t is located within a range expressed by 0.01≦t≦0.5, and Ma includes one or a plurality of elements between Fe, Co, Ni, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge, the negative active material includes at least one or more kinds of materials between lithium metals, lithium alloys, or materials capable of doping or dedoping lithium, and the average specific surface area of the negative active material is 0.5 m 2 /g or more and 10 m 2 /g or less.