Ternary precursor in multiple crystal forms and preparation method of ternary precursor

Abstract

An embodiment of the invention provides a preparation method of a ternary precursor in multiple crystal forms. The preparation method is simple and convenient to operate, and is not high in requirements to equipment, a metal salt solution is fed into a reaction kettle and reacting via a plurality of solution inlet tubes and by different flows, thus, crystallization conditions of local reaction ofthe solution at an outlet end of each solution inlet tube are different, and secondary particles which are uniformly distributed and have multiple primary particle forms can be prepared continuously.After secondary particle finished products are prepared into final batteries, the secondary particle finished products have the advantages which are different from those of the primary particle forms,and therefore, the overall performance of the batteries can be greatly improved. The ternary precursor in the multiple crystal forms is prepared by the preparation method of the ternary precursor inthe multiple crystal forms, and consists of primary particles in multiple crystal forms, advantages of various forms are integrated, each other's weakness is avoided, and the overall performance of the ternary precursor is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a polycrystalline ternary precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed rapidly in the 1990s, and are widely used in small portable electronic communication products and electric vehicles. The manufacture of battery materials is the core link in the lithium battery industry. Battery materials are divided into positive electrode materials, negative electrode materials, separators, electrolytes, etc. Cathode material is one of the key materials for manufacturing lithium-ion batteries, accounting for more than 25% of the battery cost, and its performance directly affects various performance indicators of the battery, occupying a core position in lithium-ion batteries. [0003] At present, the synthesis process of cathode materials for lithium-ion batteries in the marke...

AI Technical Summary

Problems solved by technology

[0004] Different primary particle shapes show a clear preference for the final electrical performance, for example: fine needle-shaped primary particles show better rate performance, but the capacity is low; strip-shaped primary particles show better safety performance, but the rate is biased. Low; flaky primary particles show good capacity performance, but the cycle is low, etc.

However, in the traditional preparation process, the normal preparation of the ternary precursor is realized by controlling the temperature, ammonia concentration, stirring, temperature, solid content, flow rate, and pH in the reactor, and the primary particle shape of the output is relatively simple.

In this way, after the battery is finally prepared, it will be affected by its own advantages and disadvantages, and can only be applied to a specific consumer field. For products with different application directions, the products need to re-develop raw materials and process adaptations, thus increasing the research and development. Cost of production

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