Ester organic reagent modified lithium-rich oxide positive electrode material as well as preparation method and application thereof

The invention provides an ester organic reagent modified lithium-rich oxide positive electrode material, the chemical formula of the ester organic reagent modified lithium-rich oxide positive electrode material is xLi2MnO3-(1-x) Li1 + yTM1-yO2, TM is at least one of Mn, Ni and Co, x is greater than or equal to 0.01 and less than or equal to 0.5, and y is greater than or equal to 0.01 and less thanor equal to 0.5. The ester organic reagent modified lithium-rich oxide positive electrode material is relatively high in capacity and excellent in cycle performance. When the voltage window is 2-4.8V and the current density is 200 mA/g, the specific capacity can reach 244 mAh/g, and the capacity retention ratio after 400 cycles can reach 85%. 本发明提供了一种酯类有机试剂修饰改性富锂氧化物正极材料，所述酯类有机试剂修饰改性富锂氧化物正极材料的化学式为xLi2MnO3-(1-x)Li1+yTM1-yO2，TM＝Mn、Ni、Co中的至少一种，0.01≤x≤0.5、0.01≤y≤0.5。该酯类有机试剂修饰改性富锂氧化物正极材料的容量较高，循环性能极佳。当电压窗口为2～4.8V，电流密度为200mA/g时，其比容量可达244mAh/g，400次循环后的容量保持率能够高达85％。