P2 type layered positive electrode material, preparation method thereof and sodium ion battery

The invention discloses a P2 type layered positive electrode material and a preparation method thereof, and a sodium ion battery, the chemical general formula of the layered material is Nan (LixTMyMnz) 1-bLabO2, n is greater than or equal to 0.5 and less than or equal to 1, x is greater than 0 and less than 0.3, y is greater than 0 and less than 0.3, z is greater than 0.6 and less than 1, b is greater than 0 and less than 0.1, and TM is a transition metal element. According to the layered material, the proportion of sodium, lithium, manganese and transition metal is optimized, Li < + > is doped at a TM site, anion oxidation reduction is activated, and the covalence of TM-O is regulated and controlled by doping the transition metal. Then a small amount of La is supplemented for doping, the capacity and the cycling stability of the layered material are improved, and the layered material serves as the positive electrode material in the sodium-ion battery, so that the sodium-ion battery shows high cycling stabili