Patent ID: 6984470

Claim:
A nonaqueous electrolyte secondary battery, comprising: a positive electrode containing a positive electrode active material comprising a lithium-comprising composite metal oxide; a negative electrode; and a nonaqueous electrolyte; wherein said lithium-comprising composite metal oxide has a composition represented by formula (2) given below: Li 1+y M 1−y−z M 1 z PO 4 (2) where M is at least one kind of an element selected from the group consisting of Co and Ni, M 1 is at least one kind of an element selected from the group consisting of Mg, Zr and Al, the part of the Li that is represented as the molar ratio y replace a part of the M, the M 1 that is represented as the molar ratio z replaces a part of the M, y is larger than 0 and smaller than 0.5, and z is larger than 0 and not larger than 0.5.