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Negative electrode material as well as preparation method and application thereof

A negative electrode material and solution technology, which is applied in the field of negative electrode materials and its preparation, can solve problems such as poor low-temperature discharge performance, and achieve the effects of improving mechanical strength, increasing contact, and reducing resistance

Active Publication Date: 2020-08-18
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a negative electrode material and a preparation method thereof, which are used to solve the problem of poor low-temperature discharge performance of existing lithium-ion batteries

Method used

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  • Negative electrode material as well as preparation method and application thereof
  • Negative electrode material as well as preparation method and application thereof
  • Negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The negative electrode material provided in this example is prepared by the following preparation method:

[0074] 1. Under the protection of an inert atmosphere, 97 parts of mosaic coke were graphitized at 3000°C for 48 hours to obtain graphite particles, wherein the particle size range of mosaic coke was 1-3 μm;

[0075] 2. Disperse 2 parts of asphalt into tetrahydrofuran, stir evenly, add the graphite particles obtained in step 1, and obtain the first solution after carbonization, wherein the solid content of the first solution is 30%;

[0076] 3. Disperse 1 part of multi-walled carbon nanotubes in tetrahydrofuran and stir evenly to obtain a second solution, wherein the solid content of the second solution is 0.5%;

[0077] 4. Send the first solution into the spray drying chamber through the first solution injection gun, and send the second solution into the spray drying chamber from the second solution injection gun, so that the first solution and the second solution ...

Embodiment 2

[0086] The negative electrode material provided in this example is prepared by the following preparation method:

[0087] 1. Under the protection of an inert atmosphere, 97 parts of mosaic coke were graphitized at 3000°C for 48 hours to obtain graphite particles, wherein the particle size range of mosaic coke was 1-3 μm;

[0088] 2. Disperse 2 parts of asphalt into tetrahydrofuran, stir evenly, add the graphite particles obtained in step 1, and obtain the first solution after carbonization, wherein the solid content of the first solution is 30%;

[0089] 3. Disperse 1 part of multi-walled carbon nanotubes into tetrahydrofuran and stir evenly to obtain a second solution, wherein the solid content of the second solution is 0.3%;

[0090] 4. Send the first solution into the spray drying chamber through the first solution injection spray gun, and send the second solution into the spray drying chamber from the first solution injection spray gun, so that the first solution and the s...

Embodiment 3

[0094] The negative electrode material provided in this example is prepared by the following preparation method:

[0095] 1. Under the protection of an inert atmosphere, 97 parts of pitch coke were graphitized at 3000°C for 48 hours to obtain graphite particles, wherein the particle size range of pitch coke was 1-3 μm;

[0096] 2. Disperse 2 parts of asphalt into tetrahydrofuran, stir evenly, add the graphite particles obtained in step 1, and obtain the first solution after carbonization, wherein the solid content of the first solution is 30%;

[0097] 3. Disperse 1 part of multi-walled carbon nanotubes in tetrahydrofuran and stir evenly to obtain a second solution, wherein the solid content of the second solution is 0.5%;

[0098] 4. Send the first solution into the spray drying chamber through the first solution injection gun, and send the second solution into the spray drying chamber from the second solution injection gun, so that the first solution and the second solution ...

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Abstract

The invention provides a negative electrode material as well as a preparation method and application thereof. The first aspect of the invention provides a negative electrode material. The negative electrode material comprises matrix particles and carbon nanotubes, wherein the carbon nanotubes are attached to the surfaces of at least part (0.1-2%) of the matrix particles; and the matrix particles are composed of graphite particles and a coating layer, and at least part of the surfaces of the graphite particles are covered with the coating layer. According to the negative electrode material provided by the invention, by attaching the carbon nanotubes to the surfaces of at least part of the matrix particles, the one-dimensional carbon nanotube structure is combined with a zero-dimensional material, and the carbon nanotubes not only enable the surfaces of the matrix particles to be rough, but also increase the contact between the matrix particles, so that the resistance of the negative electrode material is reduced, and the conductivity of the negative electrode material is improved; in addition, the carbon nanotubes can also improve the mechanical strength of the matrix particles, andthe low-temperature discharge performance of the lithium ion battery is further improved.

Description

technical field [0001] The invention relates to a negative electrode material, a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Background technique [0002] At present, lithium-ion batteries have been widely used in various industries. Among them, using lithium-ion batteries as the power source of automobile start-stop system can not only reduce automobile fuel consumption, but also reduce environmental pollution during automobile driving. [0003] Lithium-ion batteries used in automobile start-stop systems need to meet low-temperature discharge requirements at -30°C, so higher requirements are put forward for the low-temperature working conditions of lithium-ion batteries. At present, the negative electrode material of the existing start-stop lithium-ion battery is artificial graphite. In order to improve its low-temperature performance, the surface of graphite particles often needs to be coated with a coating agent...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 陈若凡刘春洋颜世银李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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