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Method for coating modified single crystal ternary positive electrode material with microporous conductive polymer film, modified single crystal ternary positive electrode material

A technology of conductive polymers and positive electrode materials, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems of poor cycle stability of batteries, achieve the effects of inhibiting side reactions, improving dispersion, and enhancing conductivity

Active Publication Date: 2022-02-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the battery cycle stability of the modified ternary positive electrode material in the prior art is poor, which affects the use, and a microporous conductive polymer film-coated modified single crystal ternary positive electrode material is provided. Method, modified single crystal ternary cathode material

Method used

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  • Method for coating modified single crystal ternary positive electrode material with microporous conductive polymer film, modified single crystal ternary positive electrode material
  • Method for coating modified single crystal ternary positive electrode material with microporous conductive polymer film, modified single crystal ternary positive electrode material
  • Method for coating modified single crystal ternary positive electrode material with microporous conductive polymer film, modified single crystal ternary positive electrode material

Examples

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Effect test

Embodiment 1

[0041] A method for coating a modified single crystal ternary cathode material with a microporous conductive polymer film, specifically comprising the following steps:

[0042] (1) Weigh 30g of trimethylolpropane-polyethylene glycol monomethyl ether, dehydrate at 110°C and mix with 3.41g of toluene diisocyanate, heat up to 84°C for 2.5 hours; adjust the temperature to 62°C and add 1.43g of 1 , 4-butanediol, 0.035g di(dodecylsulfide) dibutyltin, 8.75g acetone, react for 4h. The molecular weight of trimethylolpropane-polyethylene glycol monomethyl ether in the present embodiment is 2000, but not limited to 2000.

[0043] (2) LiNi 0.72 co 0.08 mn 0.2 o 2 Mix with thiophene, stir magnetically for 30 minutes to obtain a composite material; set the ultrasonic power of the CNC ultrasonic cleaner to 3W, and set the working mode to perfusion mode; add the polymer prepared in step (1) at a perfusion rate of 0.01mL / min, and load After the path code, the nozzle moves according to the s...

Embodiment 2

[0046] A method for coating a modified single crystal ternary cathode material with a microporous conductive polymer film, specifically comprising the following steps:

[0047] (1) polymer emulsion preparation process is identical with embodiment 1;

[0048] (2) LiNi 0.72 co 0.08 mn 0.2 o 2 Mix with aniline, and magnetically stir for 30 minutes to obtain a composite material; set the ultrasonic power of the numerically controlled ultrasonic cleaner to 3W, and set the working mode to perfusion mode; add the polymer prepared in step (1) at a perfusion rate of 0.01mL / min, load After the path code, the nozzle moves according to the set path, for LiNi 0.72 co 0.08 mn 0.2 o 2 / The surface of the aniline composite material is sprayed, and the spraying time is 40s; during the preparation process, aniline: LiNi 0.72 co 0.08 mn 0.2 o 2 : The mass ratio of the polymer is 1:800:54;

[0049] (3) Take 0.46g of hydrogen peroxide and disperse it in 100ml of deionized water, and a...

Embodiment 3

[0051] A method for coating a modified single crystal ternary cathode material with a microporous conductive polymer film, specifically comprising the following steps:

[0052] (1) polymer emulsion preparation process is identical with embodiment 1;

[0053] (2) LiNi 0.72 co 0.08 mn 0.2 o 2 Mix with thiophene, stir magnetically for 30 minutes to obtain a composite material; set the ultrasonic power of the CNC ultrasonic cleaner to 3W, and set the working mode to perfusion mode; add the polymer prepared in step (1) at a perfusion rate of 0.01mL / min, and load After the path code, the nozzle moves according to the set path, for LiNi 0.72 co 0.08 mn 0.2 o 2 / thiophene composite material surface is sprayed, and the spraying time is 40s; in the preparation process, thiophene: LiNi 0.72 co 0.08 mn 0.2 o 2 : The mass ratio of the polymer is 1:800:54;

[0054] (3) Take 2.43g of ferric chloride and disperse it in 100ml of deionized water, and add 2ml of hydrochloric acid wit...

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Abstract

The invention discloses a method for coating and modifying a single crystal ternary positive electrode material with a microporous conductive polymer film, and relates to the technical field of coating and modification of positive electrode materials for lithium ion batteries. The material is sprayed on the surface of the conductive monomer / NCM712 single crystal ternary positive electrode composite material, and when the phase replacement in the acid solution forms micropores, the conductive monomer is induced to undergo in-situ polymerization reaction, thereby obtaining a modified microporous conductive polymer film coating Single crystal ternary cathode material. The present invention also provides the material prepared by the above method. The beneficial effect of the invention is that the single crystal NCM712 coated and modified by the microporous conductive polymer has good interface stability, shows good cycle performance, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of coating modification of positive electrode materials of lithium ion batteries, in particular to a method for coating a modified single crystal ternary positive electrode material with a microporous conductive polymer film and the modified single crystal ternary positive electrode material. Background technique [0002] Lithium-ion batteries are an extremely attractive type of rechargeable battery. Traditional cathode materials such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 Low available specific capacity and low safety have become bottlenecks restricting the development of electric vehicles to a higher mileage. With the increase of the cruising range of electric vehicles and the gradual reduction of state subsidies, the energy density requirements for power batteries are also getting higher and higher, and the cathode materials are gradually transitioning from the initial NCM111 to NCM523, NCM622, and even...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 高明昊杨茂萍李道聪丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY