Synthesis of high-dispersion multi-element precursor

Abstract

The invention discloses a synthesis method of a high-dispersion multi-element precursor. The synthesis method comprises the following steps: a, preparing a mixed solution from metal salt and a negative additive or a positive additive by using deionized water; b, preparing a mixed solution from an alkaline precipitator and a negative additive or a positive additive by using deionized water, whereinthe additive used in the step is different from the additive used in the step A; c, adding the mixed solution obtained in the step A and the step B and an ammonia water solution into a reaction device for synthesis to obtain a reaction product; and d, sequentially filtering, washing and drying the reaction product. The method has the advantages that: 1) the purpose of controlling the reaction microenvironment is achieved through the action of two reverse additives, so that the morphology of primary particles and the size of secondary particles are effectively controlled; 2) the problem of poor sphericity of small-particle products is solved. 3) the particle morphology consistency of the blended product is improved. 4) the synthesized material is in narrow distribution, and the particle morphology consistency among different batches is high.

Description

technical field [0001] The invention relates to lithium ion battery production technology, especially a precursor production technology. Background technique [0002] With the development of cathode materials for lithium-ion batteries, there are more and more types of corresponding precursors, which brings new challenges to the performance requirements of precursor products. In the production technology of lithium-ion precursors, small particle materials often face the problem of poor sphericity. In the actual mass production process of medium and large particles, different production cycles will be blended to ensure that each batch The stability of the product, but often faced with the problem of inconsistent primary particle morphology. [0003] The reaction system of multiple precursors is: multiple metal ions + complexing agent + precipitant + H 2 O system. The speed of the chemical reaction is very fast. At almost the same time, dozens of reactions will occur in the ...

AI Technical Summary

Problems solved by technology

At present, the industrialization process of precursors generally adopts the co-precipitation synthesis method. This process method can only achieve the regulation of the microscopic reaction environment as much as possible through the regulation of macroscopic parameters, but it is increasingly difficult to meet the gradually increasing product performance requirements.

Images