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High-nickel single-crystal small-particle ternary precursor and continuous preparation method thereof

A precursor, small particle technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of mixed arrangement of nickel and lithium cations, high cost, low yield and so on

Active Publication Date: 2021-09-10
南通金通储能动力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-nickel single-crystal small-particle ternary precursor and a continuous preparation method thereof, the purpose of which is to solve the low yield and production efficiency of the existing batch method for preparing high-nickel single-crystal small-particle ternary precursors Low cost, high cost, poor batch stability, and technical problems of nickel-lithium cation mixing in the subsequent calcination process

Method used

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  • High-nickel single-crystal small-particle ternary precursor and continuous preparation method thereof
  • High-nickel single-crystal small-particle ternary precursor and continuous preparation method thereof
  • High-nickel single-crystal small-particle ternary precursor and continuous preparation method thereof

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Embodiment 1

[0053] A continuous preparation method of a high-nickel single crystal small particle ternary precursor, the preparation method comprising the following steps:

[0054] Step 1. Put Ni 2+ 、Co 2+ , Mn 2+ According to the general formula Ni 0.83 co 0.11 mn 0.06 (OH) 2 Prepare a soluble ternary mixed salt solution in the molar ratio of the corresponding elements.

[0055] Add H to the ternary mixed salt solution 2 o 2 and additive to get mixed solution, said additive is selected diethylamine pentaacetic acid for use, said additive and Ni 2+ 、Co 2+ , Mn 2+ Complexation to stabilize H 2 o 2 , H 2 o 2 will part of Mn 2+ Oxidized to Mn 3+ , to realize the refinement of the primary particle of the secondary particle and increase the specific surface area; the Mn in the mixed solution 2+ with H 2 o 2 The molar ratio of is 3.0. The concentration of the additive in the mixed solution is 0.4 mol / L, Ni 2+ 、Co 2+ , Mn 2+ The total molar concentration is 2.0mol / L.

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Embodiment 2

[0065] A continuous preparation method of a high-nickel single crystal small particle ternary precursor, the preparation method comprising the following steps:

[0066] Step 1. Put Ni 2+ 、Co 2+ , Mn 2+ According to the general formula Ni 0.90 co 007 mn 0.03 (OH) 2 Prepare a soluble ternary mixed salt solution in the molar ratio of the corresponding elements.

[0067] Add H to the ternary mixed salt solution 2 o 2 and additive to get mixed solution, said additive is selected diethylamine pentaacetic acid for use, said additive and Ni 2+ 、Co 2+ , Mn 2+ Complexation to stabilize H 2 o 2 , H 2 o 2 will part of Mn 2+ Oxidized to Mn 3+ , to realize the refinement of the primary particle of the secondary particle and increase the specific surface area; the Mn in the mixed solution 2+ with H 2 o 2 The molar ratio of is 3.0. The concentration of the additive in the mixed solution is 0.5 mol / L, Ni 2+ 、Co 2+ , Mn 2+ The total molar concentration is 2.0mol / L.

[00...

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Abstract

The invention discloses a high-nickel single-crystal small-particle ternary precursor and a continuous preparation method thereof. The method comprises the following steps of: preparing a soluble ternary mixed salt solution, and adding H2O2 and an additive to obtain a mixed solution; adding a part of the mixed solution and a precipitant solution into a first reaction kettle for nucleation reaction, and continuously overflowing a reaction product to a second reaction kettle; when the addition amount of the ternary precursor crystal nucleus slurry accounts for 40-60% of the volume of the second reaction kettle, starting stirring in the second reaction kettle; adding the other part of the mixed solution and the precipitant solution into the second reaction kettle for growth reaction, starting overflow, continuously overflowing a reaction product to a concentration machine for concentration, and returning the product to the second reaction kettle; and carrying out aging, filter-pressing, washing and drying to obtain the high-nickel single-crystal small-particle ternary precursor. The technical problems that an existing intermittent method for preparing the high-nickel single-crystal small-particle ternary precursor is low in yield, low in production efficiency, high in cost and poor in batch stability, and nickel and lithium cations are mixed in the subsequent calcination process are solved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a high-nickel single crystal small particle ternary precursor and a continuous preparation method thereof. Background technique [0002] The high-nickel single crystal ternary cathode material has the advantages of high specific capacity, low pollution, moderate price, and good matching with the electrolyte. It is considered to be a very promising lithium-ion battery cathode material and has a very broad application in the field of power batteries. market. Compared with high-nickel polycrystalline ternary cathode materials, high-nickel single-crystal ternary cathode materials have fewer grain boundaries, lower internal resistance, and better cycle performance. The high-nickel single-crystal ternary cathode material is mainly obtained by mixing and calcining high-nickel single-crystal ternary precursors and lithium sources (lithium c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B7/14
CPCC30B29/22C30B7/14
Inventor 褚凤辉李加闯朱用黄帅杰王梁梁程春雷贺建军
Owner 南通金通储能动力新材料有限公司
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