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Graphite negative electrode material and preparation method thereof

A graphite anode, graphite technology, applied in the direction of graphite, battery electrodes, structural parts, etc., can solve the problems of limiting the specific energy of lithium-ion batteries, unable to meet high-energy power sources, etc., to reduce the specific surface area, ensure stability, and ensure stable performance. Effect

Pending Publication Date: 2021-12-17
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its theoretical specific capacity is only 372mAh / g, which limits the further improvement of the specific energy of lithium-ion batteries and cannot meet the growing demand for high-energy power sources.

Method used

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  • Graphite negative electrode material and preparation method thereof

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preparation example Construction

[0024] A preparation method of graphite negative electrode material, is characterized in that, comprises the steps:

[0025] S1. Prepare graphite material, resin, and nano-silicon powder. First, weigh a certain amount of nano-silicon powder and put it into an alcohol solvent, and ultrasonically disperse it. Then add resin and graphite material, and add crosslinking agent and curing agent at the same time, and keep stirring. , mixed into a homogeneous slurry;

[0026] S2. Spray-drying the homogeneously mixed slurry to obtain a graphite powder whose surface is coated with a mixture of nano-silicon and resin;

[0027] S3, then mix the obtained graphite powder and asphalt powder evenly;

[0028] S4. Under the protection of an inert gas, heat up to 1250-1400°C at a rate of 20-35°C / min, keep warm for 1-9h, cool down naturally, and sieve after cooling to obtain a high-capacity graphite negative electrode material.

[0029] Further, the resin is one of phenol-formaldehyde resin, phe...

Embodiment 1

[0039] A preparation method for a graphite negative electrode material, comprising the steps of: preparing graphite material, resin, and nano-silica powder in a ratio of 100:20:10, first weighing 100g of nano-silica powder and putting it into an alcohol solvent, and ultrasonically dispersing it, and then separately Add 200g of resin and 1000g of graphite material, add crosslinking agent and curing agent at the same time, stir continuously, and mix into a uniform slurry; spray dry the uniformly mixed slurry to obtain graphite powder coated with a mixture of nano-silicon and resin on the surface; Then mix the obtained graphite powder and asphalt powder evenly according to the ratio of 100:4; then under the protection of inert gas, heat up to 1250°C at a speed of 20°C / min, keep warm for 3h, cool down naturally, after cooling After sieving, a high-capacity graphite negative electrode material can be obtained.

Embodiment 2

[0041] A preparation method for a graphite negative electrode material, comprising the steps of: preparing graphite material, resin, and nano-silica powder in a ratio of 100:10:15, first weighing 150g of nano-silica powder and putting it into an alcohol solvent, and ultrasonically dispersing, and then separately Add 100g of resin and 1000g of graphite material, add crosslinking agent and curing agent at the same time, stir continuously, and mix into a uniform slurry; spray dry the uniformly mixed slurry to obtain graphite powder coated with a mixture of nano-silicon and resin on the surface; Then mix the obtained graphite powder and asphalt powder evenly according to the ratio of 100:10; then under the protection of inert gas, heat up to 1300°C at a speed of 25°C / min, keep the temperature for 9 hours, and cool down naturally. After sieving, a high-capacity graphite negative electrode material can be obtained.

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Abstract

The invention relates to the field of lithium battery negative electrode materials, in particular to a preparation method of a graphite negative electrode material. The preparation method comprises the steps of preparing a graphite material, resin and nano silicon powder, firstly weighing a certain amount of nano silicon powder, putting the nano silicon powder into an alcohol solvent, carrying out ultrasonic dispersion, then respectively adding the resin and the graphite material, simultaneously adding a cross-linking agent and a curing agent, continuously stirring and mixing into uniform slurry; carrying out spray drying on the uniformly mixed slurry to obtain graphite powder of which the surface is coated with a nano silicon and resin mixture; uniformly mixing the obtained graphite powder with asphalt powder; and under the protection of inert gas, raising the temperature to 1250-1400 DEG C at the speed of 20-35 DEG C / min, preserving heat for 1-9 hours, naturally cooling, and sieving after cooling to obtain the high-capacity graphite negative electrode material. The invention provides a high-capacity graphite negative electrode material. The invention also provides a preparation method of the graphite negative electrode material. The preparation method is simple and convenient.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium batteries, in particular to a graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in various fields of civil and military use. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic equipment requires batteries to have smaller volumes and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge and discharge performance, and higher safety performance; electric vehicles require batteries with large capacity, low cost, high stability and safety performance. [0003] At present, the anode materials of commercial lithium-ion batteries use graphite-like carbon materials, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21C01B33/02H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCC01B32/21C01B33/02H01M4/366H01M4/386H01M4/587H01M4/62H01M10/0525Y02E60/10
Inventor 彭飞仰永军仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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