Multi-dimensional and multi-scale carbon-coated lithium ion battery positive electrode material and preparation method thereof

The invention provides a multi-dimensional and multi-scale carbon-coated lithium ion battery positive electrode material and a preparation method thereof.The preparation method comprises the steps that nickel cobalt lithium manganate or lithium iron phosphate serves as a raw material, graphite serves as an auxiliary material, resin serves as a grinding medium and a coated carbon raw material, and aluminum nitrate or nickel nitrate serves as a catalyst and a doping agent; stripping by using a three-roller differential grinder, cleaning the mixture for different times, adding a catalyst and a dopant, adding the raw materials, mixing by using the three-roller differential grinder, freeze-drying, and carrying out heat treatment to obtain the battery positive electrode material. The product has good conductivity and stability, the capacity, cycle performance, rate capability and other performance of the battery are improved, and the requirements of the fields of energy storage batteries, power batteries and the li