Modified high-nickel ternary positive electrode material and preparation method thereof

A high-nickel ternary material, cathode material technology, applied in the direction of positive electrode, active material electrode, electrical components, etc., can solve the problems of poor structural stability, high price, affecting battery cycle performance, etc., to achieve good mechanical properties and Solvent resistance, improving comprehensive electrical properties, and solving the problem of high residual alkali

Active Publication Date: 2021-05-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nickel-based ternary materials are widely used as cathode materials, but it is well known that with the increase of nickel content, the specific capacity of nickel-based ternary cathode materials will be greatly improved, which will cause a series of problems, such as: ① As the nickel content increases, the water absorption capacity of the positive electrode material continues to increase, resulting in a large amount of residual alkali on the surface, which affects the process and electrochemical performance of its preparation cell; ②As the nickel content increases, the cobalt content decreases, It will cause the structural stability of the material to deteriorate during charge and discharge, and affect the cycle performance of the battery
[0004] In order to solve the above problems, water washing and surface coating are commonly used at present, but water washing will generate a large amount of sewage, which will pollute the environment and destroy the lattice structure of the material, resulting in irreversible transformation; while surface coating mostly uses oxidation These oxides are expensive and used in large quantities, which will greatly increase the cost of materials, which is not conducive to commercial production

Method used

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  • Modified high-nickel ternary positive electrode material and preparation method thereof
  • Modified high-nickel ternary positive electrode material and preparation method thereof

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preparation example Construction

[0038] The second aspect of the present invention provides a method for preparing a modified high-nickel ternary positive electrode material, comprising the following steps:

[0039] Provide high nickel ternary materials;

[0040] Obtain a modified high-nickel ternary positive electrode material: After vacuum dehydration, the macromolecular polyol and diisocyanate are mixed, and then slowly add the first chain extender and crosslinking agent to it, and heat up to 60-90°C, and react for 1-4 hours At the same time, after adding a solvent to adjust the viscosity during the reaction, slowly add the second chain extender and the high-nickel ternary material, continue to react at 40-80°C for 1-4 hours, and dry to obtain a modified high-nickel ternary material. Yuan cathode material. Wherein, the vacuum dehydration of the macromolecular polyol is not particularly limited, and preferably, the vacuum dehydration is carried out at 80-120°C.

[0041] The invention innovatively uses the...

Embodiment 1

[0055] In this embodiment, the preparation steps of the modified high-nickel ternary positive electrode material are as follows:

[0056] Provide high-nickel ternary materials, and weigh the high-nickel ternary precursor Ni according to the ratio of substance amount 1:1.03 0.85 co 0.10 mn 0.05 (OH) 2 and lithium hydroxide, mixed evenly in a 3D mixer, placed in a high-temperature furnace at a rate of 12°C / min in an oxygen atmosphere to heat up to 760°C for 16 hours, and naturally cooled to below 80°C after the heat preservation was completed, that is High nickel ternary material LiNi 0.85 co 0.10 mn 0.05 o 2 .

[0057] Obtain the modified high-nickel ternary positive electrode material: add 20g of spare polypropylene carbonate diol and 1.8g of toluene diisocyanate after vacuum dehydration in a four-necked flask equipped with a polytetrafluoroethylene stirring rod, a spherical condenser and a thermometer, After stirring evenly, slowly add 1.64g of 1,4-butanediol and 0.41...

Embodiment 2

[0059] In this embodiment, the preparation steps of the modified high-nickel ternary positive electrode material are as follows:

[0060] Provide high-nickel ternary material: the steps are the same as in Example 1.

[0061] Obtain the modified high-nickel ternary positive electrode material: add 20g of polyhexamethylene carbonate glycol and 2.14g of polyhexamethylene carbonate glycol and 2.14g of 4, 4'-diphenylmethane diisocyanate, after stirring evenly, slowly add 1.83g of 1,4-butanediol and 0.49g of trimethylolpropane, raise the temperature to 82°C for 2.5h; add 2.5g of N-formazol during the reaction base pyrrolidone, then slowly add 0.151g dimethylolpropionic acid and 1397.3g high-nickel ternary material, raise the temperature to 64°C, continue the reaction for 1.5h, and spray dry to obtain the modified LiNi 0.85 co 0.10 mn 0.05 o 2 .

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Abstract

The invention provides a modified high-nickel ternary positive electrode material. The modified high-nickel ternary positive electrode material comprises a high-nickel ternary material, and a carboxylic acid type polyurethane prepolymer coating the surface of the high-nickel ternary material. The residual alkali on the surface of the high-nickel ternary material is consumed while the coating layer carboxylic acid type polyurethane prepolymer is prepared, and the prepared carboxylic acid type polyurethane prepolymer can improve the electrochemical performance of the modified high-nickel ternary positive electrode material, reduces the cost and has an application prospect.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a modified high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of society and the popularization of intelligent equipment, lithium-ion batteries have been widely concerned and researched due to their special advantages. In particular, with the rapid consumption of limited resources, the electrification of vehicles has become an irreversible trend, which has higher capacity requirements for cathode materials in lithium-ion batteries. [0003] Cathode material is one of the four key materials of lithium-ion batteries, and its performance directly affects the performance of lithium-ion batteries. At present, nickel-based ternary materials are widely used as cathode materials, but it is well known that with the increase of nickel content, the specif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 高明昊丁楚雄龙君君陈方
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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