Method for preparing precursor of positive material of nickel manganese cobalt multi-element lithium ion battery

Abstract

The invention discloses a method for preparing a precursor of a positive material of a nickel manganese cobalt multi-element lithium ion battery. The method comprises the following steps of: firstly, dissolving nickel, cobalt and manganese with deionized water, and preparing a multi-element metal salt solution with the total metal ionic molar concentration between 0.8 and 2.5mol / L, wherein the molar ratio of nickel to cobalt to manganese elements in the multi-element metal salt solution is (0-1):(0-1):(0-1); secondly, preparing alkali solution with concentration between 2 and 4mol / L; thirdly, reacting the salt solution with the alkali solution, wherein the temperature is controlled to be between 40 and 70 DEG C and the stirring speed is controlled to be between 100 and 600 revolutions / min, and the adding speed of salt and alkali solutions is controlled, so that the pH value of the reaction system is controlled to be between 8 and 11; and continuously stirring for 30 minutes to 2 hours after the reaction is completed, standing for 2 to 4 hours, filtering to obtain solid matters, and washing with deionized water until the content of Na<+> is lower than 0.03 percent, and drying to obtain the required precursor of the positive material of the nickel manganese cobalt multi-element lithium ion battery. According to the invention, an ammonia complexing agent is not used, and the method has the advantages of no ammonia or nitrogen pollution risk, good product sphericity, uniform granules, narrow granularity distribution and the like.

Description

technical field [0001] The invention belongs to the technical field of manufacturing positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of a nickel-cobalt-manganese ternary material precursor of lithium ion batteries. Background technique [0002] LiNi was first prepared by Ohzuku et al. in 2001 1 / 3 mn 1 / 3 co 1 / 3 o 2 Since then, this material has attracted extensive attention from researchers due to its high specific capacity, stable cycle performance, relatively low cost, and good safety performance. In LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 Nickel, cobalt, and manganese belong to the adjacent elements of the same period. By adjusting the molar ratio of Ni, Co, and Mn, different material properties can be achieved. In recent years, nickel-cobalt-manganese multi-component cathode materials with different components have been developed. The formula can be written as: LiNi x mn y co 1-x-y o 2 . In the process of lithium io...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcoming of the need to add ammonia water to easily cause environmental pollution when preparing lithium-ion battery cathode materials by coprecipitation in the prior art, and to provide a complexing agent that does not need to add ammonia water to prepare nickel-cobalt-manganese multi-component The method for the precursor material of the positive electrode material of the lithium ion battery, the obtained precursor material particles have good sphericity, uniform particle size, narrow distribution, and the average particle size is in about

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