The nonaqueous electrolyte secondary battery, a secondary battery using the positive electrode acti

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Provided are a cathode active material that has improved crystal-structure stability during continuous or high-voltage charging of a nonaqueous electrolyte rechargeable material, excellent cycle characteristics (capacity retention) , and high capacity, as well as a cathode and a nonaqueous electrolyte rechargeable battery containing the cathode active material. The cathode active material has a composition represented by formula (1) : €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒLi x-y Na y Co w Al a Mg b M c O 2+± wherein x, y, w, a, b, c, and ± each denotes particular values; and M stands for at least one element selected from Ca, Y, rare earth elements, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Ni, Cu, Ag, Zn, B, Ga, C, Si, Sn, N, P, S, F, and Cl; wherein the cathode active material is in the form of lithium-containing composite oxide particles having a compound adhered on a surface thereof, the compound containing at least one element selected from Al, Mg, and M.