Lithium-rich manganese-based precursor, preparation method thereof and lithium-rich manganese-based positive electrode material

Abstract

The invention relates to a lithium-rich manganese-based precursor, a preparation method thereof and a lithium-rich manganese-based positive electrode material. The preparation method of the lithium-rich manganese-based precursor comprises the following steps: (1) dissolving nickel salt, cobalt salt, manganese salt and doping ion salt in water to obtain a mixed salt solution; (2) adding a precipitant and a complexing agent into the mixed salt solution, and adjusting the pH value to obtain a reaction precursor; and (3) carrying out intermittent ultrasonic vibration on the reaction precursor to obtain a lithium-rich manganese-based precursor crude product. According to the invention, the pH value of the reaction system is adjusted, so that the particle size of the material is in an increasingstage; the particle size in the reaction system is controlled by adopting intermittent ultrasonic concussion; when the particle size exceeds a control index, the ultrasonic oscillator is started, sothat nucleation of the reaction system is rapidly carried out, and the particle size is reduced; and when the particle size is reduced to a qualified standard range, the ultrasonic oscillator is turned off, so that the particle size of the lithium-rich manganese-based precursor is controllable.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a lithium-rich manganese-based precursor, a preparation method thereof, and a lithium-rich manganese-based positive electrode material. Background technique [0002] In recent years, the field of use of lithium-ion batteries has been continuously expanding. From traditional 3C products to current electric vehicles and smart grids, the demand for lithium-ion batteries, especially high-energy-density lithium batteries, in the new energy industry is becoming more and more urgent. To meet this demand, a great deal of research effort has been devoted to finding and developing electrode materials with high specific capacity. Lithium-rich manganese-based cathode materials have attracted in-depth research by many experts and scholars in the industry because of their high specific capacity, good thermal stability, good cycle performance, wide charge and disch...

AI Technical Summary

Problems solved by technology

The shape and particle size of the lithium-rich precursor obtained by the method are not uniform, which ultimately affects the electrochemical performance of the lithium-rich manganese-based positive electrode material

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