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Preparation method of coated modified high-nickel ternary positive electrode material and prepared material

A cathode material and modification technology, applied in the field of prepared materials and preparation methods, can solve the problems of affecting the overall performance of the battery with interfacial stability, unable to ensure uniform and continuous coating, etc., and achieve excellent electrochemical stability and excellent elasticity. and ductility, the effect of reducing side effects

Active Publication Date: 2021-05-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the dry coating in the prior art cannot guarantee the uniformity and continuity of the coating, thus affecting the stability of the interface and the overall performance of the battery.

Method used

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  • Preparation method of coated modified high-nickel ternary positive electrode material and prepared material
  • Preparation method of coated modified high-nickel ternary positive electrode material and prepared material
  • Preparation method of coated modified high-nickel ternary positive electrode material and prepared material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a coated modified high-nickel ternary positive electrode material, specifically comprising the following steps:

[0048] 1. Preparation of modified polymer emulsion

[0049] S1, the preparation steps of modified lignin amine are as follows:

[0050] Weigh lignin, diethanolamine, and deionized water at a mass ratio of 1:1.5:10, mix them evenly, and adjust the pH value to 9 with ammonia water; add formaldehyde to the above solution, heat to 60°C for 4 hours, and then add it to isopropanol A brown precipitate was obtained, and after suction filtration, it was repeatedly washed with isopropanol for 4 times, and then transferred to 60°C for 2 hours in a vacuum to obtain a modified lignin amine, which was named L-DEA; during the reaction, lignin, formaldehyde, isopropyl The mass ratio of alcohol is 1:1.5:28;

[0051] S2, the preparation steps of modified polymer emulsion are as follows:

[0052] Add trimethylolpropane-polyethylene glycol monomethyl e...

Embodiment 2

[0058] A method for preparing a coated modified high-nickel ternary positive electrode material, specifically comprising the following steps:

[0059] 1. The preparation of the modified polymer emulsion is the same as in Example 1.

[0060] 2. The preparation steps of coated modified high-nickel cathode material are as follows:

[0061] Take LiN i0.85 co 0.10 mn 0.05 o 2 The high-nickel ternary positive electrode material is added to the modified polymer emulsion, and the mass ratio of the positive electrode material to the emulsion is 5:1. It is solidified by spray drying to form a film to obtain a coated and modified high-nickel ternary positive electrode material.

[0062] Button electrical assembly, testing, and LSV testing are the same as in Example 1.

[0063] The above-mentioned positive electrode is assembled into a button battery, and the specific capacity is 193.8mAh·g when it is charged and discharged at a rate of 1C within the cut-off voltage range of 2.75-4.3...

Embodiment 3

[0065] A method for preparing a coated modified high-nickel ternary positive electrode material, specifically comprising the following steps:

[0066] 1. The preparation of the modified polymer emulsion is the same as in Example 1.

[0067] 2. The preparation steps of coated modified high-nickel cathode material are as follows:

[0068] Take LiN i0.85 co 0.10 mn 0.05 o 2 The high-nickel ternary positive electrode material is added to the modified polymer emulsion, and the mass ratio of the positive electrode material to the emulsion is 8:1. It is solidified by spray drying to form a film to obtain a coated and modified high-nickel ternary positive electrode material.

[0069] Button electrical assembly, testing, and LSV testing are the same as in Example 1.

[0070] The above-mentioned positive electrode is assembled into a button battery, and the specific capacity is 195.9mAh·g when charging and discharging at a rate of 1C within the cut-off voltage range of 2.75-4.3V -...

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Abstract

The invention discloses a preparation method of a coated modified high-nickel ternary positive electrode material, and relates to the technical field of lithium ion battery positive electrode materials. The preparation method comprises the following steps: (1) preparation of a lignin amine modified polymer emulsion: reacting diisocyanate with dihydric alcohol, adding organic amine modified lignin to replace an amine chain extender to prepare a modified polymer emulsion; and (2) adding the high-nickel ternary positive electrode material into the modified polymer emulsion obtained in the step (1), then carrying out spray drying, and curing to form a film, thereby obtaining the coated modified high-nickel ternary positive electrode material. The preparation method has the beneficial effects that spray drying and curing film forming are adopted, a polymer coating layer is continuous and uniform, good mechanical properties are provided for the material, structural changes caused by reduction of a cobalt content can be inhibited, meanwhile, a large amount of sewage brought by a wet coating process is reduced, and the manufacturing cost is decreased.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a preparation method of a coated modified high-nickel ternary cathode material and the obtained material. Background technique [0002] Lithium-ion batteries (LIBs) have undergone rapid development due to their special advantages and the enormous attention paid to high-energy storage systems in both academia and industry. In particular, with the expansion of LIBs applications, achieving high volumetric energy density and power density has become an inevitable development trend. The ternary layered cathode material has the advantages of high specific capacity, energy density, and power density, and has become the focus of research on cathode materials for lithium-ion batteries in recent years. With the continuous increase of nickel content in nickel-based ternary cathode materials, the specific capacity of the material will be greatly improved, but t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10H01M4/505H01M4/131H01M4/1391C01G53/50C01P2006/40
Inventor 高明昊龙君君朱文婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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