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A kind of modified hard carbon negative electrode material and preparation method thereof

A negative electrode material and hard carbon technology, which is applied in the field of modified hard carbon negative electrode materials and its preparation, can solve the problems of low first effect, insignificant improvement of first effect, and low first effect of coated hard carbon materials.

Active Publication Date: 2021-04-23
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the improvement of the first effect of hard carbon, most of them use the coating process to improve it at present, but there are problems such as the improvement of the first effect is not obvious, the material is seriously bonded and agglomerated, and the high temperature cycle is poor.
Patent 201210060117.X reports that the first effect of coated hard carbon materials is less than 83%; patent 201410651767.0 uses polypyrrole-coated hard carbon materials with a first effect of less than 70%; patent 201711011186.0 involves the first effect of coated hard carbon materials. to 85%

Method used

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  • A kind of modified hard carbon negative electrode material and preparation method thereof
  • A kind of modified hard carbon negative electrode material and preparation method thereof
  • A kind of modified hard carbon negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add phenol to deionized water and stir until dissolved, add dropwise commercially available ammonia water with 25% ammonia content to adjust the pH to 10, and then add formaldehyde solution with a mass fraction of 37% according to the molar ratio of 1:1 (phenol: formaldehyde) , and stirred and mixed at a speed of 200rpm for 0.5 hours, heated to 50°C for 4 hours of polycondensation reaction to obtain a phenolic resin gel, then transferred to a closed reactor and further aged at 80°C for 8 hours; then put it into a vacuum oven Vacuum dry at 100°C for 10 hours to remove the solvent to obtain phenolic resin, and use a high-speed pulverizer to crush through a 60-mesh standard sieve to obtain phenolic resin powder. Under the protection of nitrogen, the obtained resin powder is heated at 5°C / min to 600°C for pre-carbonization 2 hour, after being down to room temperature, process and adjust the particle diameter (D50) to about 9 μm with airflow pulverization to obtain a hard car...

Embodiment 2

[0024] Add phenol to deionized water and stir until dissolved, add dropwise commercially available ammonia water with 25% ammonia content to adjust the pH to 10, and then add formaldehyde solution with a mass fraction of 37% according to the molar ratio of 1:1 (phenol: formaldehyde) , and stirred and mixed at a speed of 200rpm for 0.5 hours, heated to 50°C for 4 hours of polycondensation reaction to obtain a phenolic resin gel, then transferred to a closed reactor and further aged at 80°C for 8 hours; then put it into a vacuum oven Vacuum dry at 100°C for 10 hours to remove the solvent to obtain phenolic resin, and use a high-speed pulverizer to crush through a 60-mesh standard sieve to obtain phenolic resin powder. Under the protection of nitrogen, the obtained resin powder is heated at 5°C / min to 600°C for pre-carbonization 2 hour, after being down to room temperature, process with jet milling and adjust the particle diameter (D50) to about 9 μm to obtain a hard carbon precur...

Embodiment 3

[0026] Add phenol into deionized water and stir until dissolved, add dropwise commercially available ammonia water with 25% ammonia content to adjust the pH to 10, and then add formaldehyde solution with a mass fraction of 37% according to the molar ratio of 1:2 (phenol: formaldehyde) , and stirred and mixed at a speed of 200rpm for 0.5 hours, heated to 50°C for 4 hours of polycondensation reaction to obtain a phenolic resin gel, then transferred to a closed reactor and further aged at 80°C for 8 hours; then put it into a vacuum oven Vacuum dry at 100°C for 10 hours to remove the solvent to obtain phenolic resin, and use a high-speed pulverizer to crush through a 60-mesh standard sieve to obtain phenolic resin powder. Under the protection of nitrogen, the obtained resin powder is heated at 5°C / min to 600°C for pre-carbonization 2 hour, after being down to room temperature, process and adjust the particle diameter (D50) to about 9 μm with airflow pulverization to obtain a hard c...

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Abstract

The invention discloses a preparation method of a modified hard carbon negative electrode material, comprising the following steps: dissolving a phenol monomer in deionized water, adjusting the pH to be alkaline, which is recorded as A solution; adding a certain proportion of aldehyde to the A solution Monomer, stir evenly to obtain B solution, and obtain phenolic resin gel through polycondensation reaction; put the phenolic resin gel into the heating reactor and carry out cross-linking and aging reaction at 50-80°C, cool down to room temperature for vacuum drying and coarse crushing treatment to obtain phenolic resin; pre-carbonize the phenolic resin at a temperature of 500-800°C under the protection of an inert gas, and then pulverize the hard carbon precursor after the temperature drops to room temperature; load the active lithium compound on the hard carbon precursor carbonization treatment at a temperature of 1000-1350°C under the protection of inert gas, and the modified hard carbon can be obtained by sieving after the temperature drops to room temperature. The modified hard carbon negative electrode material prepared by the preparation method has high reversible specific capacity and high charge and discharge efficiency.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a modified hard carbon negative electrode material and a preparation method thereof. Background technique [0002] As a typical amorphous carbon, hard carbon has a wide lithium intercalation potential and a Li+ diffusion coefficient much higher than that of graphite, so it has excellent safety, rate characteristics and cycle characteristics. Focus. Hard carbon anode materials are one of the important development directions of anode materials for lithium-ion batteries in the future. Its high capacity, high power, and good low-temperature performance are suitable for many fields such as start-stop power supplies, electric vehicles, and electric tools. [0003] However, at present, the overall development progress of domestic hard carbon anode materials is slow, and no mature products have been introduced to the market so far, mainly due to the substandard performance of the mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 仰永军葛传长
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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