Preparation method of sulfur anion doped lithium-rich cathode material

The invention discloses a preparation method of a sulfur anion doped lithium-rich cathode material. The preparation method comprises the steps of weighing quantitative nickel sulfate (NiSO4) and manganese sulfate (MnSO4) according to a molar ratio and dissolving the NiSO4 and the MnSO4 in de-ionized water; then slowly adding an NaOH solution to the abovementioned solution for sedimentation so as to obtain a mixed metal salt sediment in a certain proportion; uniformly mixing a small amount of lithium sulfide powder and lithium salt powder with the mixed metal salt sediment; then putting the mixture in a muffle furnace and heating to 200-500 DEG C for pre-sintering and then heating to 600-1000 DEG C for calcinations so as to obtain sintered powder; and adding an activating agent to the sintered power for activation, drying and then putting the sintered powder to the muffle furnace for sintering at 200-500 DEG C for 3-5 h so as to obtain the sulfur anion doped lithium-rich cathode material. The preparation method of the sulfur anion doped lithium-rich cathode material is simple in operation, the obtained lithium-rich cathode material has relatively good cycling stability and rate discharge performance, and the first efficiency is more than 95%.