POSITIVE ELECTRODE ACTIVE MATERIAL AND PREPARATION METHOD THEREFOR, SODIUM-ION BATTERY, AND DEVICE COMPRISING SODIUM-ION BATTERY

摘要

The present application discloses a positive electrode active material and its preparation method, a sodium ion battery and an apparatus containing the sodium ion battery. The positive electrode active material satisfies a chemical formula of Na1-xCuhFekMnlMmO2-y wherein M is one or more selected from Li, Be, B, Mg, Al, K, Ca, Ti, Co,Ni, Zn, Ga, Sr, Y,Nb, Mo, In,Sn, and Ba, 0 < x ≤ 0.33, 0 < h ≤ 0.24, 0 ≤ k ≤ 0.32, 0 < l ≤ 0.68, 0 ≤ m < 0.1, h+k+l+m = 1, 0 ≤ y < 0.2, and the positive electrode active material has a water content of 6000 ppm or less.