Preparation method for multiple precursors with concentrated particle size distribution by multistage continuous synthesis

Abstract

Disclosed is a preparation method for multiple precursors with concentrated particle size distribution by multistage continuous synthesis. The preparation method comprises the following steps of: 1) preparing a metal salt solution, an alkali solution and an ammonium hydroxide solution; 2) enabling a reaction kettle and a solid concentration thickener to be connected in series; 3) injecting the metal salt solution, the alkali solution and the ammonium hydroxide solution into the reaction kettle 1, wherein the slurry in the reaction kettle 1 is pumped into the thickener 1 for solid-liquid separation to increase solid content when the liquid level in the reaction kettle 1 reaches the full kettle state, and the thick slurry in the thickener 1 is pumped into a reaction kettle 2; 4) performing stirring when the reaction kettle 2 is full of the slurry, and adding the metal salt solution, the alkali solution and the ammonium hydroxide solution to continue a continuous precipitation reaction, and then overflowing the product in the reaction kettle 2 into an aging tank 1; and 5) enabling the product in the aging tank 1 to be centrifuged, washed and dried. The preparation method has the advantages that the technology is simple, easily operated, energy-saving and environment-friendly. The product features good appearance, concentrated particle size distribution, high vibration density andhigh efficiency.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery precursor, in particular to a preparation method of a multi-stage continuous method for synthesizing a concentrated particle size distribution and a variety of precursors. Background technique [0002] As a mature energy device, lithium-ion batteries are widely used in various commercial electronics fields. As one of the branches, ternary cathode material batteries have expanded strongly in recent years under the dual background of policy-driven and demand-driven. In the field of automotive power batteries, The ternary series of power batteries has sprung up, expanding its market share year by year. With the release of information such as the double credit policy of domestic automobile manufacturers and the timetable for banning the sale of fuel vehicles in various countries, the future of ternary series power batteries is just around the corner. [0003] Today, the mainstream of co-pr...

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Problems solved by technology

[0003] Today, the mainstream of co-precipitation synthesis of lithium battery ternary precursors is continuous method and batch method. The batch method uses a single reactor for production without overflow, and adopts the method of settling and extracting the supernatant after the tank is full until the product reaches the particle size requirement. Downtime, the product particle size obtained by this method is concentrated, but the production efficiency is low, and the production capacity cannot be released

The continuous method also uses a single reactor for production, but continuously feeds materials and overflows continuously at the same time. When the particle size in the reactor reaches the requirement, adjust the process parameters to keep the particle size range of the material always within the control range. This method maximizes the release of The production capacity of the reactor, but the product structure is single, unable to meet the needs of simultaneous production of multiple products, the production line lacks adjustability, the product particle size distribution is wide, and the cycle life of the battery after the material is made is poor

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