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A kind of preparation method of high-nickel system ternary cathode precursor

A precursor and positive electrode technology, which is applied in the field of preparation of high-nickel ternary positive electrode precursors, can solve problems such as attenuation and variable capacity, and achieve improved particle size distribution, uniform particle size distribution, and accelerated mass and heat transfer processes. Effect

Active Publication Date: 2022-04-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the particle size distribution is not concentrated, it will have a direct impact on the accumulation of materials, and the steric effect caused by this impact will directly affect the deintercalation of lithium ions, which will lead to the electrochemical performance of lithium batteries (cycle stability, rate, etc.) performance) deterioration and rapid capacity fading

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The application provides a method for preparing a high nickel-based ternary positive electrode precursor, the method comprising:

[0041] Using nickel salt, cobalt salt and manganese salt as raw materials, preparing the first solution;

[0042] preparing a sodium carbonate solution, adding a surfactant to the sodium carbonate solution and mixing uniformly to obtain a second solution;

[0043] The first solution and the second solution are subjected to a synthesis reaction to obtain a synthesis reaction product, and the synthesis reaction product is filtered, washed and dried to obtain a high-nickel-based ternary positive electrode precursor; the synthesis reaction is carried out in a micro in a channel reactor.

[0044] In the present application, the molar ratio of the nickel salt, cobalt salt and manganese salt is 3-8:1-3:1-3.

[0045] In the present application, the concentration of the first solution is 0.003-0.5mol / L.

[0046] In the present application, the con...

Embodiment 1

[0060] A preparation method for a high-nickel series ternary positive electrode material precursor for lithium-ion batteries, specifically comprising the following steps:

[0061] Step a, preparation of A solution: with CoSO 4 ·7H 2 O, MnSO 4 4H 2 O, NiSO 4 ·6H 2 O is the raw material, and it is prepared into a mixed salt solution, and the nickel ion concentration is 0.06mol / L, the cobalt ion concentration is 0.02mol / L, and the manganese ion concentration is 0.02mol / L (NCM622).

[0062] Step b, preparing solution B: preparing a sodium carbonate solution with a concentration of 0.01mol / L.

[0063] Step c to prepare solution C: Weigh an appropriate amount of surfactant CTAB and add it to solution B and mix evenly to make the concentration 0.03mmol / L.

[0064] Step d, synthesis reaction: when the synthesis reaction starts, the A solution and the C solution are simultaneously flowed into the microchannel reactor to carry out the co-precipitation reaction, wherein a pump is i...

Embodiment 2

[0069] The difference between this example and Example 1 is that: the reaction in a three-necked flask and the traditional co-precipitation preparation method of continuous stirring with a magnetic stirrer are adopted.

[0070] The product each index that embodiment 2 prepares sees Figure 4 , Figure 5 , Image 6 ;

[0071] from Figure 4 From the laser particle size diagram in , it can be seen that the particle size distribution of the precursor of the synthesized ternary cathode material is roughly normal, but the particle size distribution is not uniform, the particle size is between 239-2301nm, and PDI=0.489.

[0072] from Figure 5 as well as Image 6 It can be seen from the EDS analysis diagram and SEM diagram in the figure that the distribution of the precursors Ni, Co and Mn of the synthesized ternary cathode material is not uniform.

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Abstract

The invention relates to a method for preparing a high-nickel-based ternary positive electrode precursor. The method of the invention includes: using nickel salt, cobalt salt and manganese salt as raw materials, preparing a first solution; preparing a sodium carbonate solution, adding the sodium carbonate to the A surfactant is added to the solution and mixed evenly to obtain a second solution; the first solution and the second solution are subjected to a synthesis reaction to obtain a synthesis reaction product, and the synthesis reaction product is filtered, washed and dried to obtain a high A nickel-based ternary cathode precursor; the synthesis reaction is carried out in a microchannel reactor.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method of a high-nickel system ternary cathode precursor. Background technique [0002] In lithium-ion batteries, the cathode material is the most important component and the most critical part that determines its electrochemical performance. The performance of the cathode material largely depends on the size and shape of the material particles. High-nickel-based (Ni>=0.6) cathode materials are used in lithium-ion batteries and have great application potential as a power source for new energy vehicles. However, in high-nickel-based cathode materials, the contents of Ni, CO, and Mn have Non-equivalent ratio relationship, and the solubility products of the three are quite different, which will cause problems such as uneven precipitation, formation of impurity phases, and cation mixing, and it is easy to form a non-stoichiometric high-nickel-based pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M10/0525
CPCH01M4/362H01M4/502H01M4/523H01M10/0525H01M2004/028Y02E60/10
Inventor 施利毅赵尹梁华丽袁帅王竹仪张美红王漪
Owner SHANGHAI UNIV
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