High-performance ternary precursor and preparation method thereof

Abstract

The invention discloses a preparation method of a high-performance ternary precursor. The preparation method comprises the following steps: 1, preparing a first mixed solution of Ni, Co, Mn, an oxidizing agent, a complexing agent and rare earth salt; preparing a second mixed solution of Ni, Co, Mn, a complexing agent and rare earth salt; preparing a sodium hydroxide or potassium hydroxide solution as a precipitator; preparing a third mixed solution of an aluminum source and an additive; 2, adding a precipitator, pure water, an additive and a complexing agent into a reaction kettle to prepare a base solution, the pH of the base solution being 12.65-12.85, and the temperature being 50-70 DEG C; 3, introducing nitrogen, and respectively adding the first mixed solution, the third mixed solution and a precipitant into the reaction kettle for co-precipitation; the overflow liquid flowing to a transfer tank with the initial particle size being 1.2-1.6 microns; after 600-1000 minutes, stopping adding of the first mixed solution and feeding the second mixed solution, transferring the slurry in the transfer tank into the reaction kettle when the particle size reaches 2.4-3.0 microns, and stopping the operation when the particle sizes of the first mixed solution and the second mixed solution both reach 2.4-3.0 microns; and 4, carrying out filter pressing, washing and drying on the obtained slurry to obtain the high-nickel ternary precursor. According to the invention, the transmission speed of lithium ions in the material is improved, and the agglomeration phenomenon can be avoided.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a high-performance ternary precursor and a preparation method thereof. Background technique [0002] Conventional Ni5X series ternary cathode material technology has become relatively mature after years of development, and the competitive advantage of peers is no longer there. In addition, vehicle-mounted power batteries require cathode materials that can adapt to high-current charging and discharging and have good rate performance. Conventional Ni5X series ternary cathode materials cannot meet this condition. [0003] Therefore, in order to make the Ni5X series ternary cathode materials better applied in electric vehicles, researchers have made a series of modifications to the conventional Ni5X series ternary cathode materials. An appropriate amount of aluminum and lanthanum replacing manganese in Ni5X series ternary cathode materials can eff...

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Problems solved by technology

In addition, vehicle-mounted power batteries require cathode materials that can adapt to high-current charging and discharging and have good rate performance. Conventional Ni5X series ternary cathode materials cannot meet this condition

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