Sodium-ion battery positive electrode material precursor uniformly doped with stable valence state elements, preparation method thereof and sodium-ion battery positive electrode material

The invention provides a sodium battery positive electrode material precursor uniformly doped with stable valence state elements, a preparation method thereof and a sodium battery positive electrode material. The chemical formula of the positive electrode material precursor is NixFeyMnzM (1-x-y-z) (OH) 2, x is more than or equal to 0.10 and less than or equal to 0.40, y is more than or equal to 0.20 and less than or equal to 0.50, z is more than or equal to 0.20 and less than or equal to 0.50, and x + y + zlt is obtained, m is a metal element with a stable valence state and comprises one or more of Ca, Mg, Zn, Cu, Zr, Ti, Sr, Ba and Sn, the precursor stabilizes metal oxygen bonds and enlarges the unit cell volume by doping elements, and the sodium battery positive electrode material prepared from the precursor is more stable in structure and better in capacity and cycle performance. 本发明提供了一种稳定价态元素均匀掺杂的钠电正极材料前驱体及其制备方法、钠电正极材料，正极材料前驱体的化学式为NixFeyMnzM(1-x-y-z)(OH)2，0.10≤x≤0.40，0.20≤y≤0.50，0.20≤z≤0.50，x+y+z