To provide a new lithium-containing metal compound having excellent charging/discharging cycle property, charging voltage continuously changing in one step, and low cost, and to establish a condition for reaction and a composition optimum for synthesis, and to provide a nonaqueous electrolyte battery excellent in charging/discharging cycle property using the above compound as a cathode activator.

The nonaqueous electrolyte battery having a cathode and an anode uses an oxide expressed by general formula (1); LixH1-xNiyFezMaO2, as a cathode activator, (wherein, M denotes one element chosen from Al, Zn, Ca, Sr, Nb, Mg, Cd, Cu, V, Cr, Mo, Ti, W, and Ag, 0<X/(Y+Z)≤1, 0.95≤Y+Z+a≤1.1, 0.025≤Z/(Y+Z)≤0.1, 0≤a≤0.05).