Method for reducing content of miscellaneous lithium in high-nickel positive electrode material

A cathode material, high nickel technology, applied in the field of lithium ion batteries, can solve the problems of destroying the lattice stability of high nickel materials and high cost, improving the decrease of electron and lithium ion diffusion rate, improving lattice stability, and saving costs. Effect

Active Publication Date: 2021-01-22
GEM WUXI ENERGY MATERIAL CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, it is necessary to provide a method for reducing the content of lithium in the high-nickel positive electrode material, so as to solve the technical problems that the cost of the existing method in the prior art is high and the lattice stability of the high-nickel material will be destroyed

Method used

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  • Method for reducing content of miscellaneous lithium in high-nickel positive electrode material
  • Method for reducing content of miscellaneous lithium in high-nickel positive electrode material
  • Method for reducing content of miscellaneous lithium in high-nickel positive electrode material

Examples

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Effect test

Embodiment 1

[0031] With 1000g nickel-cobalt-aluminum molar ratio 88:7:5 particle diameter D50 is the nickel-cobalt-aluminum composite hydroxide precursor of 18um, and 1.81g Mg(OH) 2 And 473g lithium hydroxide monohydrate (molar ratio Li:Me=1.025:1) joins in the small-scale high-speed mixer, unloads after mixing 0.5h, packs in the sagger, burns in oxygen atmosphere 780 ℃ (overburning (calcination temperature 50°C) for 10h, then 500g of one-fired NCA and 2.86g of boron oxide were fired at 250°C for 6h to obtain a high-nickel cathode material A.

[0032] With 1000g nickel-cobalt-aluminum molar ratio 88:7:5 particle diameter D50 is the nickel-cobalt-aluminum composite hydroxide precursor of 2.3um, and 1.81g Mg(OH) 2 And 473g lithium hydroxide monohydrate (molar ratio Li:Me=1.025:1) joins in the small-scale high-speed mixer, unloads after mixing 0.5h, packs in the sagger, burns (overburned at 740 ℃ in oxygen atmosphere) (calcination temperature 40°C) for 10h, and then 500g of one-fired NCA an...

Embodiment 2

[0036] With 1000g nickel-cobalt-aluminum molar ratio 88:7:5 particle diameter D50 is the nickel-cobalt-aluminum composite hydroxide precursor of 18um, and 1.81g Mg(OH) 2 And 473g lithium hydroxide monohydrate (molar ratio Li:Me=1.025:1) joins in the small-scale high-speed mixer, unloads after mixing 0.5h, packs in the sagger, burns in oxygen atmosphere 810 ℃ (overburning (calcination temperature 80°C) for 10h, and then 500g of one-fired NCA and 2.86g of boron oxide were fired at 250°C for 6h to obtain a high-nickel cathode material.

[0037] With 1000g nickel-cobalt-aluminum molar ratio 88:7:5 particle diameter D50 is the nickel-cobalt-aluminum composite hydroxide precursor of 2.3um, and 1.81g Mg(OH) 2 And 473g lithium hydroxide monohydrate (molar ratio Li:Me=1.025:1) joins in the small-scale high-speed mixer, unloads after mixing 0.5h, packs in the sagger, burns in oxygen atmosphere 780 ℃ (overburning (calcination temperature 80°C) for 10h, and then 500g of one-fired NCA and...

Embodiment 3

[0040] With 1000g nickel-cobalt-aluminum molar ratio 88:7:5 particle diameter D50 is the nickel-cobalt-aluminum composite hydroxide precursor of 18um, and 1.81g Mg(OH) 2 And 473g lithium hydroxide monohydrate (molar ratio Li:Me=1.025:1) joins in the small-sized high-speed mixer, unloads after mixing 0.5h, packs in the sagger, burns (overburned at 760 ℃ in oxygen atmosphere) (calcination temperature 30°C) for 10h, and then 500g of one-fired NCA and 2.86g of boron oxide were fired at 250°C for 6h to obtain a high-nickel cathode material A.

[0041] With 1000g nickel-cobalt-aluminum molar ratio 88:7:5 particle diameter D50 is the nickel-cobalt-aluminum composite hydroxide precursor of 2.3um, and 1.81g Mg(OH) 2 And 473g lithium hydroxide monohydrate (molar ratio Li:Me=1.025:1) joins in the small-sized high-speed mixer, unloads after mixing 0.5h, packs in the sagger, burns in oxygen atmosphere 730 ℃ (overburning (calcination temperature 30°C) for 10h, and then 500g of one-fired NC...

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Abstract

The invention relates to a method for reducing the content of miscellaneous lithium in a high-nickel positive electrode material. The method comprises the following steps: uniformly mixing a high-nickel ternary composite precursor A, an additive A and a lithium salt in a lower ratio, carrying out overburning, adding an additive B, uniformly mixing, and sintering to obtain a high-nickel positive electrode material A; uniformly mixing a high-nickel ternary composite precursor B with an additive A and a lithium salt with a relatively low ratio, performing overburning, then adding an additive B, performing uniform mixing, and performing sintering to obtain a high-nickel positive electrode material B; and uniformly mixing the high-nickel positive electrode material A and the high-nickel positive electrode material B to obtain the high-nickel positive electrode material. According to the invention, on the premise of not changing the whole process, the content of miscellaneous lithium on thesurface of the material is reduced by increasing the primary sintering temperature and reducing the Li/Me molar ratio; and by mixing the small-particle high-nickel positive electrode ternary material,the problem that the diffusion rate of electrons and lithium ions is reduced due to overburning is solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for reducing the content of lithium impurities in high-nickel positive electrode materials. Background technique [0002] In recent years, with the large-scale application of lithium-ion batteries in the field of energy storage, electric tools, and electric vehicles, new energy materials have developed rapidly. High-nickel ternary cathode materials are a kind of new energy materials. Due to their high energy The advantage of density has been favored by a large number of researchers. Compared with medium and low nickel ternary cathode materials, high nickel ternary cathode materials have the characteristics of high specific capacity, high cost, high content of impurity lithium, and poor lattice stability. Among them, the high content of impurity lithium may increase the commercialization of lithium ion The gas production of the battery will also affect its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 许开华李顺利李伟施杨刘德宠周晓燕陈玉君徐世国
Owner GEM WUXI ENERGY MATERIAL CO LTD
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