Method for preparing spherical Ni-Co-Mn ternary precursor by nitrogen-free complexing agent

Abstract

The invention discloses a method for preparing a spherical Ni-Co-Mn ternary precursor by a nitrogen-free complexing agent. The method includes preparing Ni-Co-Mn mixed saline solution with metal ion total concentration being 1.0-2.0 mol / L from nickel salt, cobalt salt and manganese salt, adding the Ni-Co-Mn mixed saline solution, sodium hydroxide solution and the nitrogen-free complexing agent into a reaction kettle simultaneously, reacting under reaction temperature ranging from 53 DEG C to 57 DEG C in protection of protective gas while keeping pH value of mixture in the reaction kettle being10.9 to 11.1, continuing to add the three types of solution for 6 hours, ageing for 10 hours, performing solid and liquid separation to obtain the spherical Ni-Co-Mn ternary precursor Ni<1-x-y>Co<x>Mn<y>(OH)<2>. By the method, the spherical Ni-Co-Mn ternary precursor with high compactness can be prepared, the complexing agent utilized for preparing the precursor is odorless, nontoxic and free ofnitrogen, and accordingly production environment can be improved while workload in treating pollutant in production waste water can be reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a method for assisting the preparation of a spherical nickel-cobalt-manganese ternary precursor by a non-nitrogen-containing complexing agent. Background technique [0002] Lithium-ion battery cathode material is one of the four important components of lithium-ion batteries, which plays a vital role in the electrochemical performance and safety performance of lithium-ion batteries. With the rapid development of electric vehicles, higher performance requirements are put forward for lithium-ion battery-related electrode materials. Since lithium nickel cobalt manganese oxide (LiNi 1-x-y co x mn y o 2 ) The ternary material has the advantages of high capacity, long cycle life, etc., and can flexibly adjust the ratio of nickel, cobalt, and manganese according to the application needs, so this material has become the mainstream product...

AI Technical Summary

Problems solved by technology

The spherical nickel-cobalt-manganese ternary precursor Ni 1-x-y co x mn y (OH) 2 The preparation method all adopts controlled crystallization method, and all adopts ammoniacal liquor as complexing agent, for example: Chinese patents such as CN105731553A, CN106684351A, CN106920934A all adopt this method; This method not only ammoniacal liquor smells big, and production environment is not good, and The content of ammonia nitrogen in production wastewater is high, and the treatment cost is high. Therefore, it is urgent to develop a method for preparing spherical nickel-cobalt-manganese ternary precursors that do not use ammonia water as a complexing agent.

[0004] In the prior art, "Research on New Electrode Materials for Lithium Ion Batteries" (Wang Chuanbao, Nanjing University of Aeronautics and Astronautics, 2012) proposed a method of using EDTA (ethylenediaminetetraacetic acid) as a complexing agent to prepare spherical nickel-cobalt-manganese The method of precursors can successfully produce spherical nickel-cobalt-manganese ternary precursors with high density. Since EDTA has no smell, the production environment has been greatly improved, but EDTA still contains nitrogen, and the production wastewater The content of ammonia nitrogen is still high, and the difficulty of wastewater treatment remains unresolved

Images