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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] 500 grams of silica powder, 4 grams of multi-wall carbon nanotube powder, inserted into the coating apparatus, start the coating apparatus, run at 15 m / s line speed for 5 minutes. In this embodiment, the silicon oxide particles have a particle diameter of 5 to 10 microns and a density of 1.1 grams / cubic centimeter. Multi-wall carbon nanotubes are fibrous agglomerates having a tube diameter of 50 nm and a length of 25 microns and a heap density of 0.1 g / cm. During the operation of the cladding equipment, the multi-wall carbon nanotubes are dispersed into a mesh, due to the linear velocity and shear force, and the surface of the silicon oxide has a layer of carbon black wrap, so that the carbon nanotubes are embedded into the surface of the silicon oxide. Carbon black layer. After the coating is completed, a carbon nanotube coating is formed on the surface of the silicon oxide, the coating layer having a thickness of 100 nm to obtain a carbon nanotube...

Example Embodiment

[0023] Example 2

[0024] 500 grams of silica powder, 4 grams of multi-wall carbon nanotube powder, in which the composition and form of silicon oxide and multi-walled carbon nanotubes are in the same embodiment. The built-in device is started to run 5 minutes at a line speed of 10 m / s. During the operation of the cladding equipment, the multi-wall carbon nanotubes are dispersed into a mesh, due to the linear velocity and shear force, and the surface of the silicon oxide has a layer of carbon black wrap, so that the carbon nanotubes are embedded into the surface of the silicon oxide. Carbon black layer. After the coating is completed, a carbon nanotube coating is formed on the surface of the silicon oxide, the coating layer having a thickness of 100 nm to obtain a carbon nanotube coated silicon negative material. The coating apparatus is in the same embodiment 1. The powder obtained by the nanotube obtained by the coating apparatus is a powder made of micron particles, and the p...

Example Embodiment

[0025] Example 3

[0026] The oxide silicon powder is 500 grams, and 0.5 grams of 8012 single-walled carbon nanotubes, 2 grams of multi-wall carbon nanotubes are put into the coating apparatus, wherein the single-walled carbon nanotubes are 2 nm and the length is 50 microns. Fibrillary agglomerates having a heap density of 0.01 g / cm centimeters. The composition of the silicon oxide, the multi-wall carbon nanotubes and the form of the same embodiment. The built-in device is started for 5 minutes at a line speed of 15 m / s. During the operation of the cladding equipment, the single-walled carbon nanotubes and multi-walled carbon nanotubes are dispersed into a mesh, due to the large line velocity and shear force, and the surface of the silicon oxide has a layer of carbon black wrap, which makes carbon nanotubes. Carbon black layers embedded in silicon oxide surfaces. After the coating is completed, a carbon nanotube cladding layer is formed on the surface of the silicon oxide, the...

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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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