A method for reducing the content of lithium impurities in high-nickel cathode materials

A positive electrode material, high-nickel technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of high cost and damage to the lattice stability of high-nickel materials, and achieve the effect of improving lattice stability and saving costs

Active Publication Date: 2022-05-17
GEM WUXI ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • 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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  • A method for reducing the content of lithium impurities in high-nickel cathode materials
  • A method for reducing the content of lithium impurities in high-nickel cathode materials
  • A method for reducing the content of lithium impurities in high-nickel cathode materials

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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 lithium in a high-nickel cathode material, comprising the following steps: uniformly mixing a high-nickel ternary composite precursor A, an additive A, and a lithium salt with a lower proportion, and then burning it, and then adding the additive B is mixed evenly and sintered to obtain high-nickel positive electrode material A; the high-nickel ternary composite precursor B, additive A, and lithium salt with a lower ratio are mixed evenly and then sintered, and then additive B is added to mix evenly and then sintered to obtain a high-nickel positive electrode material B; uniformly mix the high-nickel positive electrode material A and the high-nickel positive electrode material B to obtain a high-nickel positive electrode material. On the premise of not changing the overall process, the present invention reduces the content of impurity lithium on the surface of the material by increasing the temperature of the first sintering and reducing the Li / Me molar ratio; at the same time, the present invention improves the above-mentioned The problem of decreased diffusion rate of electrons and lithium ions due to overburning.

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 Patents(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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