POSITIVE ELECTRODE ACTIVE MATERIAL FOR ELECTRIC DEVICE, POSITIVE ELECTRODE FOR ELECTRIC DEVICE, AND ELECTRIC DEVICE

A positive electrode active material for an electric device contains a first active material and a second active material. The first active material is composed of a transition metal oxide represented by formula (1): Li 1.5 [Ni a Co b Mn c [Li] d ]O 3 ...(1) (where, in the formula (1), a, b, c and d satisfy relationships: 0