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A kind of modified high nickel material and preparation method thereof

A high-nickel, modified technology, applied in secondary battery repair/maintenance, structural parts, electrical components, etc., can solve the problems of poor material storage performance, enhanced material air sensitivity, and simultaneous recovery of lithium residues without deep removal. , to achieve stable chemical properties, good cycle stability and safety performance, and reduce air sensitivity

Active Publication Date: 2021-06-15
江西九鼎动力新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2013, a study by Li Xinhai and others from Central South University found that the simple water washing treatment enhanced the air sensitivity of the material while removing excess lithium residues, but water washing made the storage performance of the material worse.
[0007] So far, a large number of research work and patent documents at home and abroad have focused on the solution of simple water washing to remove lithium residues or simple surface coating, but there is no deep removal of lithium residues while recovering valuable Li. + 、Al 3+ Ions, related technologies for building stable surface and interface structures

Method used

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  • A kind of modified high nickel material and preparation method thereof
  • A kind of modified high nickel material and preparation method thereof
  • A kind of modified high nickel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The filter press tank used in the embodiment of the present invention is as figure 1 As shown, the top of the filter press tank is provided with a water inlet and an air inlet, and the water inlet and the air inlet are respectively provided with a water inlet valve and an air inlet valve. The inside of the filter press tank is equipped with a stirring device, a stainless steel mesh support plate, and a filter cloth. A filter cloth is provided on the stainless steel mesh support plate, and the stainless steel mesh support plate divides the interior of the filter press tank into upper and lower parts. A water outlet is provided at the bottom of the lower part of the filter press tank, and a water outlet valve is arranged at the water outlet.

Embodiment 2

[0037] A preparation method of a modified high-nickel material, comprising the following steps:

[0038] (1) The high-nickel material precursor is prepared by the lithium sintering process: the high-nickel material precursor Ni 0.6 co 0.30 al 0.10 (OH) 2 Put it in a ball mill with lithium hydroxide at a molar ratio of 1:1.03 for material mixing, place the uniformly mixed material in a sintering furnace, and sinter at 550°C for 4 hours under an oxygen atmosphere, then heat up to 750°C for 10 hours. Obtain high nickel material Li 1.03 Ni 0.6 co 0.30 al 0.10 o 2 ;

[0039] (2) The high nickel material Li 1.03 Ni 0.6 co 0.30 al 0.10 o 2 The national standard method GB / T 11064.1-1989 is used to determine the lithium residue content of the material;

[0040] (3) The high nickel material Li 1.03 Ni 0.6 co 0.30 al 0.10 o 2 The material is evenly placed on the filter cloth in the sealed high-efficiency washing filter press tank in Example 1 and reinforced and sealed,...

Embodiment 3

[0047] A preparation method of a modified high-nickel material, comprising the following steps:

[0048] (1) The high-nickel material precursor is prepared by the lithium sintering process: the high-nickel material precursor Ni 0.995 al 0.005 (OH) 2 and lithium hydroxide in a ball mill at a molar ratio of 1: 1.05 for material mixing, place the uniformly mixed material in an oxygen atmosphere in a sintering furnace, sinter at 550°C for 4 hours, and then heat up to 750°C for 10 hours to obtain High nickel material Li 1.05 Ni 0.995 al 0.005 o 2 ;

[0049] (2) The high nickel material Li 1.05 Ni 0.995 al 0.005 o 2 The national standard method GB / T 11064.1-1989 is used to determine the lithium residue content of the material;

[0050] (3) The high nickel material Li 1.05 Ni 0.995 al 0.005 o 2 The material is evenly placed on the filter cloth in the sealed high-efficiency washing filter press tank in Example 1 and reinforced and sealed, and ammonium fluoride is dissol...

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Abstract

The invention discloses a modified high-nickel material and a preparation method thereof. The outer surface of the modified high-nickel material has lithium fluoride and Li 3 AlF 6 The composite coating layer; the preparation method is as follows: inject ammonium fluoride solution into the high-nickel material and continue to stir for water washing treatment, and then perform tempering heat treatment after rapid dehydration, and finally form a surface with uniform lithium fluoride and Li 3 AlF 6 The high-nickel material of the composite cladding layer; the method of the present invention can simultaneously realize the deep removal of lithium residues on the surface, the efficient recovery of dissolved metal ions and the preparation of a fluoride cladding layer for protecting materials; the prepared fluoride cladding layer is compared with The cladding layer prepared by the traditional method is more stable and uniform, the process is simple, the process is short, and the production cost is low; the modified high-nickel material prepared has better cycle stability and safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a modified high-nickel material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are recognized by the international community as the most ideal chemical power source due to their high energy density, long life, small self-discharge, no memory effect, and environmental protection. Therefore, lithium-ion batteries are used in various fields. In recent years, the growing demand for electric vehicles has brought a broader development space for lithium-ion batteries. [0003] The development of high-capacity, high-safety lithium-ion batteries has very important economic value and national strategic significance. The new generation of cathode materials represented by high-nickel materials for lithium-ion batteries has become the most promising cathode material for power batteries in recent years because of their advantages such as low pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/42H01M10/052
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/052H01M10/4235Y02E60/10
Inventor 段建国张英杰黄雪松董鹏王丁
Owner 江西九鼎动力新能源科技股份有限公司
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