Multi-layer coated positive electrode material and preparation method thereof

The invention relates to a multi-layer coated positive electrode material and a preparation method thereof. According to the multi-layer coated positive electrode material, the surface of the material is uniformly coated with the first coating layer, and the coating layer can control element diffusion between the substrate and the second coating layer through uniform coating and thickness regulation, so that a specific surface doping and coating structure is formed. The surface of the first coating layer is coated with the second coating layer, and the coating layer can avoid a competitive reaction among elements in the form of doped hydroxide, thereby being beneficial to control of surface morphology and improvement of coating uniformity. The double-layer coating design can significantly improve the lithium ion transmission performance and the element dissolution stability of the lithium ion battery positive electrode material. In addition, the method is simple in process and easy to realize industrial produ