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Method for coating silicon negative electrode material with carbon nano tube

A technology of carbon nanotubes and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of inability to remove impurities of metal catalysts, affect storage performance, and high cost, achieve high commercial value, high practicability, and reduce manufacturing costs. The effect of small cost and volume expansion

Pending Publication Date: 2022-04-15
SHENZHEN NANOTECH PORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

, but this solution cannot remove the metal catalyst impurities, which will aggravate the self-discharge of the battery and affect the storage performance
Moreover, the output is limited, mass production is difficult, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 500 grams of silicon oxide powder and 4 grams of multi-walled carbon nanotube powder into the coating equipment, start the coating equipment, and run for 5 minutes at a linear speed of 15 m / s. In this embodiment, the silicon oxide particles have a particle size of 5-10 microns and a density of 1.1 g / cm 3 . Multi-walled carbon nanotubes are fibrous aggregates with a diameter of 50 nanometers, a length of 25 microns, and a bulk density of 0.1 g / cm3. During the operation of the coating equipment, the multi-walled carbon nanotubes are dispersed into a network. Due to the high linear velocity and shear force, and the surface of the silicon oxide is covered with a layer of carbon black, the carbon nanotubes are embedded in the surface of the silicon oxide. carbon black layer. After the coating is completed, a carbon nanotube coating layer is formed on the surface of the silicon oxide, and the thickness of the coating layer is 100 nanometers to obtain a silicon negative ...

Embodiment 2

[0024] Take 500 grams of silicon oxide powder and 4 grams of multi-wall carbon nanotube powder and put them into the coating equipment, wherein the composition and form of silicon oxide and multi-wall carbon nanotubes are the same as in Example 1. Start the cladding equipment and run it for 5 minutes at a line speed of 10m / s. During the operation of the coating equipment, the multi-walled carbon nanotubes are dispersed into a network. Due to the high linear velocity and shear force, and the surface of the silicon oxide is covered with a layer of carbon black, the carbon nanotubes are embedded in the surface of the silicon oxide. carbon black layer. After the coating is completed, a carbon nanotube coating layer is formed on the surface of the silicon oxide, and the thickness of the coating layer is 100 nanometers to obtain a silicon negative electrode material coated with carbon nanotubes. Described cladding equipment is with embodiment 1. The nanotube-coated silicon negativ...

Embodiment 3

[0026] Get 500 grams of silicon oxide powder, 0.5 grams of 8012 single-wall carbon nanotubes, and 2 grams of multi-wall carbon nanotubes into the coating equipment, wherein the single-wall carbon nanotubes have a diameter of 2 nanometers and a length of 50 microns. Fibrous aggregates with a bulk density of 0.01 g / cm3. The composition and morphology of the silicon oxide and multi-walled carbon nanotubes are the same as in Example 1. Start the cladding equipment and run it for 5 minutes at a line speed of 15m / s. During the operation of the coating equipment, single-walled carbon nanotubes and multi-walled carbon nanotubes are dispersed into a network. Due to the high linear velocity and shear force, and the surface of silicon oxide is covered with a layer of carbon black, the carbon nanotubes A layer of carbon black embedded in the surface of silicon oxide. After the coating is completed, a carbon nanotube coating layer is formed on the surface of the silicon oxide, and the th...

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Abstract

The invention relates to a method for coating a silicon negative electrode material with a carbon nano tube. The method comprises the following steps of: a, putting carbon nano tube powder and silicon negative electrode material powder into coating equipment according to a weight ratio of (0.1-2): (99.9-98); b, starting the coating equipment, and operating for 1-20 minutes at the rotating speed of 3-40m / s to enable the carbon nanotubes to form a coating layer on the surface of the silicon negative electrode material, so as to obtain the carbon nanotube coated silicon negative electrode material; and c, the obtained nanotube-coated silicon negative electrode material is powder formed by micron-sized particles, and the particle size of the particles is 5-10 microns. The invention has the characteristics of uniform coating, good conductivity, small volume expansion, high capacity, no introduction of other metal impurities, low manufacturing cost, strong practicability and the like.

Description

【Technical field】 [0001] The invention relates to the technical field of preparation of negative electrode materials for lithium batteries, in particular to a method for coating silicon negative electrode materials with carbon nanotubes. 【Background technique】 [0002] At present, commercial lithium-ion batteries generally use graphite carbon materials as negative electrodes, and the theoretical capacity of graphite is 372mAh / g. This low capacity limits the energy density of lithium-ion batteries. The theoretical capacity of the silicon negative electrode material is 4200mAh / g, and the theoretical capacity of silicon oxide is 2000mAh / g, which is the first choice for the new generation of battery negative electrode materials. However, during the intercalation and extraction of lithium ions, the volume of silicon oxide will expand violently, which will easily cause the capacity of lithium-ion batteries to decrease or even short circuit. [0003] Much work has been done to imp...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/10H01M4/36H01M4/38H01M4/62
Inventor 郜天宇
Owner SHENZHEN NANOTECH PORT
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