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

Abstract

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%.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and more specifically relates to a lithium-rich oxide cathode material modified by an ester organic reagent and a preparation method and application thereof. Background technique [0002] Due to the advantages of high voltage, large specific energy, long cycle life, small self-discharge, and good safety performance, lithium-ion batteries have been widely used in electronic products, transportation, aerospace, and energy storage devices. At present, high-capacity cathode materials are the key to realizing high-energy-density lithium-ion batteries, and lithium-rich oxides have become the most potential candidate cathode materials for next-generation lithium-ion batteries because of their high specific capacity and high energy density. However, the traditional lithium-rich oxide materials suffer from the disadvantages of low initial Coulombic efficiency and fast capacity and voltage de...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies and shortcomings of the above-mentioned prior art, the present invention provides a positive electrode material modified by ester organic reagents to modify lithium-rich oxides. The modified lithium-rich oxides modified by ester organic reagents not only overcome the traditional Oxide materials have the disadvantages of fast capacity decay and poor cycle performance. They also have the advantages of high capacity, simple synthesis process, easy control, and good repeatability. They have great commercial prospects.

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