Coating method for improving electrochemical property of high-nickel ternary nickel cobalt manganese anode material

A cathode material, nickel cobalt manganese technology, applied in the field of lithium ion battery cathode materials, can solve the problems of poor product uniformity, uneven coating layer, etc., to inhibit the dissolution of metal ions, promote Li + diffusion, and improve discharge capacity. Effect

Active Publication Date: 2018-07-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technical steps, after hydrothermal or solvothermal reaction, are filtered and washed and then mixed with lithium source, the resulting product has poor uniformity and uneven coating layer.

Method used

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  • Coating method for improving electrochemical property of high-nickel ternary nickel cobalt manganese anode material
  • Coating method for improving electrochemical property of high-nickel ternary nickel cobalt manganese anode material
  • Coating method for improving electrochemical property of high-nickel ternary nickel cobalt manganese anode material

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Embodiment 1

[0032] A coating method for improving the electrochemical performance of a high-nickel ternary nickel-cobalt-manganese positive electrode material proposed by the present invention comprises the following steps:

[0033] S1. According to lithium titanate: high-nickel ternary nickel-cobalt-manganese cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 The mass ratio is 1:100. Dissolve n-butyl titanate in 30ml of absolute ethanol, dissolve under 400rpm magnetic stirring to form a solution, add lithium acetate to dissolve, and then add citric acid to obtain a mixed solution;

[0034] S2, 5g high-nickel ternary nickel-cobalt-manganese cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Disperse evenly in 50ml of absolute ethanol, stir thoroughly for 30min with magnetic force, add the mixed solution in S1 dropwise, and stir with magnetic force for 30min, transfer to 100ml hydrothermal reaction kettle after mixing evenly, place in a drying oven, at 180°C Reaction 24h obtains reaction solution...

Embodiment 2

[0039] A method for coating the electrochemical performance of a high-nickel ternary nickel-cobalt-manganese positive electrode material, comprising the following steps:

[0040] S1. According to lithium titanate: high-nickel ternary nickel-cobalt-manganese cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 The mass ratio is 1:100. Dissolve n-butyl titanate in 30ml of absolute ethanol, dissolve under 400rpm magnetic stirring to form a solution, add lithium acetate to dissolve, and then add citric acid to obtain a mixed solution;

[0041] S2, 5g high-nickel ternary nickel-cobalt-manganese cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Disperse evenly in 50ml of absolute ethanol, stir fully with magnetic force for 30min, add the mixed solution in S1 dropwise, and fully magnetically stir for 30min, stir and evaporate to gel at 70°C, add to a vacuum drying oven, at 80 Drying at ℃ for 12h to obtain the positive electrode material mixture;

[0042] S3. Heating the positive electrode m...

Embodiment 3

[0053] A coating method for improving the electrochemical performance of a high-nickel ternary nickel-cobalt-manganese positive electrode material proposed by the present invention comprises the following steps:

[0054] S1, dissolving the titanium source in a solvent to form a solution, adding a lithium source to dissolve, and then adding citric acid to obtain a mixed solution;

[0055] S2, uniformly dispersing the high-nickel ternary nickel-cobalt-manganese positive electrode material in a solvent, adding the mixed solution in S1, mixing evenly, and performing a hydrothermal reaction to obtain a reaction solution;

[0056] S3, evaporating the reaction solution in S2 to a gel state, and obtaining the positive electrode material mixture after drying;

[0057] S4. Calcining the positive electrode material mixture in S3 to obtain a high-nickel ternary nickel-cobalt-manganese positive electrode material with a lithium titanate coating layer on the surface.

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Abstract

The invention discloses a coating method for improving electrochemical properties of a high-nickel ternary nickel cobalt manganese anode material. The coating method comprises the following steps: dissolving a titanium source into a solvent so as to obtain a solution, dissolving a lithium source, and further adding citric acid so as to obtain a mixed solution; uniformly dispersing a high-nickel ternary nickel cobalt manganese anode material into a solvent, adding the mixed solution, uniformly mixing, and performing a hydrothermal reaction or a solvent thermal reaction so as to obtain a reaction solution; evaporating the reaction solution to a gel state, and drying so as to obtain an anode material mixture; calcining the anode material mixture, thereby obtaining the high-nickel ternary nickel cobalt manganese anode material with a lithium titanate coating layer. The coating method for improving the electrochemical properties of the high-nickel ternary nickel cobalt manganese anode material, which is disclosed by the invention, is simple in process, low in cost and good in repeatability, the obtained coating layer is high in crystallization degree, small in particle size and good inuniformity, and the charge and discharge specific capacity, the circulation property and the multiplying power of the high-nickel ternary nickel cobalt manganese anode material can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a coating method for improving the electrochemical performance of high-nickel ternary nickel-cobalt-manganese cathode materials. Background technique [0002] With the increasing demand for high-energy batteries, researchers have been stimulated to study lithium-ion batteries with high performance. Among them, high-nickel ternary cathode materials have attracted much attention due to their advantages of high energy density, but the disadvantages of high-nickel materials such as strict storage conditions, poor cycle performance and poor thermal stability limit their practical application. [0003] Surface coating is an effective method to solve the problems of irreversible capacity loss and cycle deterioration of the battery. The existence of the coating layer hinders the direct contact between the electrolyte and the active material, reduces side rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张冉张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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