Lithium ion battery nickel-cobalt-doped lithium manganate positive electrode material and preparation method thereof

The invention relates to the fields of lithium ion battery positive electrode materials, lithium ion batteries and the like, in particular to a Lithium ion battery nickel-cobalt-doped lithium manganate positive electrode material and a preparation method thereof. The method comprises the following steps: A, mixing and grinding or ball-milling 0.5-0.8 mol of a manganese compound, 0.15-0.35 mol of a nickel compound, 0.05-0.15 mol of a cobalt compound, 0.55-0.6 mol of a lithium compound and 0.95-1.2 mol of an oxidizing agent into a reaction mixture, and transferring the obtained reaction mixture into a reaction kettle; B, mixing 12 to 20 g of a surfactant, 180 to 250 mL of water, 50 to 100 mL of a surfactant auxiliary agent and 100 to 150 mL of alkane to prepare a microemulsion; c, adding the microemulsion into the reaction kettle, mixing, sealing, reacting, and naturally cooling; and D, taking out the mixture, filtering, washing, and drying to obtain the product. According to the invention, a micro-emulsion hyd