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A method for repairing a degraded ternary cathode material and the obtained ternary cathode material

A positive electrode material and repair method technology, applied in the direction of positive electrodes, active material electrodes, electrical components, etc., can solve the problems of electrochemical performance degradation, etc., and achieve the effect of low price, great application value and social significance, and simple process

Active Publication Date: 2021-06-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the previous measures to prevent the degradation or deterioration of the electrochemical performance of materials, the present invention mainly aims at remediating the problem that the electrochemical performance of the nickel-rich ternary cathode material has been reduced or deteriorated during the preparation, transportation and storage.

Method used

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  • A method for repairing a degraded ternary cathode material and the obtained ternary cathode material
  • A method for repairing a degraded ternary cathode material and the obtained ternary cathode material
  • A method for repairing a degraded ternary cathode material and the obtained ternary cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0055] (1) Using petroleum ether as a solvent, the high-nickel cathode material precursor Ni 0.8 Co 0.1 Mn 0.1 (OH) 2 Perform mechanical ball milling with LiOH in a molar ratio of 1:1.05 for 6 hours, then evaporate the petroleum ether to dryness, place the mixed material in a tube furnace, and sinter at 650 °C for 3 hours under an oxygen atmosphere, and then sinter at 800 °C for 10 hours. Cool to room temperature, grind and sieve for later use, number NCM811-1.

[0056] (2) The nickel-rich ternary material NCM811-1 was placed in an environment with a temperature of about 30°C and an air humidity of about 80% for 60 days to obtain a ternary cathode material NCM811-2 with performance degradation or deterioration. The electrochemical properties before and after are shown in Table 1.

[0057] (3) Add 0.04g of repairing agent aluminum metaphosphate to the solvent containing 20g of absolute ethanol, after stirring at 400r / min for 10min, add 2g of NCM811-2 material and continue t...

Embodiment 2

[0064] (1) 0.04g repairing agent yttrium metaphosphate is added to the solvent containing 20g absolute ethanol, after stirring at 400r / min for 10min, adding 2g of NCM811-2 material obtained by Example 1 and continuing to stir at the same rotational speed for 30min, then, The temperature was heated to 95°C and stirring was continued until the ethanol evaporated completely to obtain product B.

[0065] (2) Place product B in a tube furnace at 2°C for min -1 The heating rate was increased to 600 °C, sintered in an oxygen atmosphere for 6 h, and cooled to room temperature to obtain a cathode material NCM811-2@LYPO repaired by yttrium metaphosphate.

[0066] (3) use scanning electron microscope (SEM) to test and analyze NCM811-1, NCM811-2 obtained in Example 1 and NCM811-2@LYPO in Example 2, and obtain its SEM image, such as image 3 shown.

[0067] (4) Assemble the NCM811-2@LYPO obtained in Example 2 into a 2016-type button battery and conduct a charge-discharge test within the ...

Embodiment 3

[0070] (1) Using petroleum ether as a solvent, the high-nickel cathode material precursor Ni 0.9 Co 0.05 Mn 0.05 (OH) 2 Perform mechanical ball milling with LiOH in a molar ratio of 1:1.05 for 6 hours, then evaporate the petroleum ether to dryness, place the mixed material in a tube furnace, and sinter at 650 °C for 3 hours under an oxygen atmosphere, and then sinter at 720 °C for 10 hours. Cool to room temperature, grind and sieve for later use, number NCM90.

[0071] (2) The nickel-rich ternary material NCM90 was placed in an environment with a temperature of about 30°C and an air humidity of about 80% for 60 days to obtain a ternary cathode material NCM90-1 whose performance was degraded or deteriorated. The electrochemical properties of the materials are shown in Table 1.

[0072] (3) Add 0.04g of repairing agent aluminum metaphosphate to the solvent containing 20g of absolute ethanol, stir at 400r / min for 10min, add 2g of NCM90-1 material and continue to stir at the s...

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Abstract

The invention discloses a method for repairing a ternary positive electrode material with degraded performance and the obtained ternary positive electrode material. The material repairing method is to disperse the repairing agent into an organic solvent, and after ultrasonic dispersion, add the ternary positive electrode material with degraded performance under continuous stirring, and obtain the repaired ternary positive electrode material after filtration and high-temperature sintering. The interface of the ternary material can be adjusted by adjusting parameters such as the amount of the repairing agent. At the same time, the repairing agent can react with the residual lithium on the surface of the material to form a stable compound, which is beneficial to reduce the residual lithium on the surface of the material and can significantly restore the properties of the material. The present invention breaks the previous technical idea of ​​preventing performance decline or deterioration of lithium battery ternary positive electrode materials, and instead performs remedial treatment on materials that have declined and deteriorated, solving the problem of ternary positive electrode materials in the process of preparation, transportation and storage. problem that has not been effectively resolved.

Description

technical field [0001] The invention relates to the technical field of repairing battery positive electrode materials, in particular to a method for repairing a ternary positive electrode material with degraded performance and a ternary positive electrode material repaired by the method. Background technique [0002] Lithium-ion batteries have been greatly developed since they were introduced to the market by Sony in 1990. Lithium-ion batteries are composed of positive and negative electrode materials, separators and electrolytes. Positive and negative electrode materials are the key to improving the energy density of lithium-ion batteries, and are also the main factors affecting the electrochemical performance of batteries. Traditional cathode materials include lithium cobalt oxide (LiCoO 2 ), lithium iron phosphate (LiFePO 4 ) and lithium manganate (LiMn) 2 O 4 ), etc., with the continuous development of lithium-ion batteries, the application field of lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 唐有根冯泽王海燕孙旦张珊
Owner CENT SOUTH UNIV