Positive electrode material, preparation method thereof and lithium ion battery

The invention relates to a positive electrode material and a preparation method thereof, and a lithium ion battery, the positive electrode material comprises: a base material, the base material being a lithium transition metal composite oxide; the coating layer is positioned on the surface of the base material and comprises tungsten oxide WO3-a doped with metal ions; wherein a is more than 0 and less than 0.5; in the coating layer, the doping concentration of the metal ions is gradually reduced from the surface of the base material to the surface of the positive electrode material. The surface of the positive electrode material is provided with the coating layer, so that the electronic conductivity and the ionic conductivity of the coating layer can be improved, and the rate capability of the positive electrode material is improved. 本申请涉及正极材料及其制备方法、锂离子电池，正极材料包括：基体材料，所述基体材料为锂过渡金属复合氧化物；位于所述基体材料表面的包覆层，所述包覆层包括掺杂金属离子的氧化钨WO3-a；其中，0＜a＜0.5；在所述包覆层中，所述金属离子的掺杂浓度自所述基体材料的表面至所述正极材料的表面逐渐降低。本申请的正极材料表面具有包覆层，能够改善包覆层的电子导电性和离子导电