Preparation method for coating negative electrode material with vapor deposition carbon nanotube

A technology of carbon nanotubes and vapor deposition, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of poor cycle stability, complicated preparation methods, and low conductivity, and achieve the solution of silicon The effect of poor conductivity, simple preparation method, and simple preparation process

Active Publication Date: 2020-05-22
上海旦元新材料科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, silicon also has obvious disadvantages as the negative electrode material of lithium-ion batteries: firstly, as a semiconductor material, silicon itself has low electrical conductivity; secondly, in the process of charging and discharging, with the intercalation and extraction of lithium ions, the volume of silicon material changes greatly, resulting in material Pulverization and shedding will eventually lead to detachment from the current collector and poor cycle stability; finally, although methods such as doping and nanonization can be used to improve the electrochemical performance of silicon-based materials, these preparation methods are relatively complicated and costly , it is not easy to be prepared on a large scale, and the electrochemical performance of the prepared material needs to be further improved

Method used

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  • Preparation method for coating negative electrode material with vapor deposition carbon nanotube
  • Preparation method for coating negative electrode material with vapor deposition carbon nanotube
  • Preparation method for coating negative electrode material with vapor deposition carbon nanotube

Examples

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Embodiment 1

[0029] Example 1 Preparation Method of Coating Silicon Negative Electrode Material with Vapor-Deposited Carbon Nanotubes

[0030] This embodiment is a method for preparing a silicon negative electrode material coated with vapor-deposited carbon nanotubes, including the following steps in sequence:

[0031] Catalyst preparation: take the raw materials for the catalyst, prepare a catalyst solution, and sinter the catalyst solution at 650°C to obtain a catalyst powder;

[0032] Mixing: Put 1000g of silicon powder with a particle size of 100nm and 1g of catalyst into a VC mixer at 1500r / min and mix for 60min, then take it out;

[0033] Reduction: Put the mixed powder into the fluidized bed and pass H 2 Restore the powder, the flow rate is 1L / min and the reduction is 20min;

[0034] Fluidization: continue to reduce the powder obtained by using N in the fluidized bed 2 Fluidize with the flow rate of 400L / min, feed carbon source gas with the flow rate of 200L / min, in the present e...

Embodiment 2~5

[0038] Embodiments 2-5 Preparation method of coating silicon negative electrode material with vapor-deposited carbon nanotubes

[0039] Embodiments 2 to 5 are a method for preparing a silicon negative electrode material coated with vapor-deposited carbon nanotubes. The preparation process is the same as that of Example 1. The difference lies in the parameters during the preparation process. For details, see Table 1 below:

[0040] Table 1 Parameters in the preparation process

[0041] .

[0042] Wherein, the raw material component that makes catalyst is all the same as embodiment 1, and difference is that the consumption of each component is different, and concrete proportioning sees table 2:

[0043] Table 2 makes the content of each component in the raw material of catalyst

[0044] .

[0045] Wherein, the selection of the transition metal material is different from that in Example 1, and the components of the carrier material are the same as those in Example 6. The d...

Embodiment 6

[0048] Example 6 Microstructure of silicon anode material coated with vapor-deposited carbon nanotubes

[0049] In order to observe the structure of the vapor-deposited carbon nanotube tube-coated silicon negative electrode material prepared by the present invention, the materials prepared in Examples 1 to 3 were imaged under a scanning electron microscope, as shown in Figure 1~3 Shown is the SEM (scanning electron microscope) image of the material. According to the pictures, it can be seen that carbon nanotubes are deposited in silicon powder, so that they are coated on the surface of silicon particles to form a conductive network; therefore, the conductivity of silicon powder can be improved by using the method of the present invention.

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Abstract

The invention discloses a preparation method for coating a negative electrode material with a vapor deposition carbon nanotube. The preparation method sequentially comprises the following steps that silicon powder and a catalyst are placed into a stirrer to be mixed and taken out; powder obtained through mixing is placed in a fluidized bed, and H2 reduced powder is introduced; the powder obtainedthrough reduction continues to be fluidized in the fluidized bed through N2, carbon source gas is introduced, reacting is carried out under the furnace temperature ranging from 500 DEG C to 1000 DEG C, and a reaction product A is obtained; and the reaction product A is subjected to airflow crushing to obtain a finished product. The preparation method is simple, and the cost is low; and for the prepared material, electrical conductivity of an electrode is enhanced, expansion and shrinkage in the process that silicon is disembedded from lithium are limited, and the preparation method is suitablefor negative electrodes of all lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a preparation method of a silicon negative electrode material coated with vapor-phase deposited carbon nanotubes. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, small self-discharge, wide operating voltage range, no memory effect, long service life, and no environmental pollution. They have been widely used in electronic products, electric vehicles, and energy storage fields. At present, the application of negative electrode materials is mainly based on traditional graphite materials, but the specific capacity of graphite is close to the theoretical value of 372mAh / g, and there is little room for improvement, which limits the energy density of lithium-ion batteries. Silicon-carbon composite materials have become the development trend of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/02C23C16/26C23C16/442C23C16/455H01M4/36H01M4/38H01M4/62H01M10/0525B01J23/78B82Y30/00B82Y40/00
CPCB01J23/78B01J35/0033B82Y30/00B82Y40/00C23C16/02C23C16/26C23C16/4417C23C16/442C23C16/455H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 顾灵锋杨丽娜舒显全
Owner 上海旦元新材料科技有限公司
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