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A carbon-coated silicon/metal/carbon nanotube negative electrode composite material and its preparation method

A technology of carbon nanotubes and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as high cost, difficult industrial production, complex process, etc., to improve electrical conductivity, Avoid pulverization and shedding, overcome the effect of low electronic conductivity

Active Publication Date: 2022-03-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are complex in process, high in cost, and difficult for industrial production.

Method used

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  • A carbon-coated silicon/metal/carbon nanotube negative electrode composite material and its preparation method
  • A carbon-coated silicon/metal/carbon nanotube negative electrode composite material and its preparation method
  • A carbon-coated silicon/metal/carbon nanotube negative electrode composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a carbon-coated silicon / metal / carbon nanotube negative electrode composite material, comprising the steps of:

[0028] S1. Etching the nano-silicon powder with a hydrofluoric acid solution for 6 hours to obtain porous nano-silicon;

[0029] S2, ultrasonically dispersing the porous nano-silicon obtained in step S1 in the multi-walled carbon nanotube solution, ultrasonically oscillating to disperse the carbon nanotubes in the porous silicon, adding copper nitrate, ultrasonically dispersing evenly, and standing for 2 hours to obtain a mixed solution, and The mixed solution was spray-dried at 100°C for 10 hours, and ground to obtain a composite material;

[0030] S3. Methane is passed into the composite material obtained in step S2 for step sintering, wherein the first gradient sintering temperature in step sintering is 300° C., and the time is 3 hours; the second gradient sintering temperature is 800° C., and the time is 3 hours, namely have to.

Embodiment 2

[0032] A method for preparing a carbon-coated silicon / metal / carbon nanotube negative electrode composite material, comprising the steps of:

[0033] S1. Etching the nano-silicon powder with a hydrofluoric acid solution for 6 hours to obtain porous nano-silicon;

[0034] S2, ultrasonically disperse the porous nano-silicon obtained in step S1 in the single-walled carbon nanotube solution, ultrasonically oscillate to disperse the carbon nanotubes in the porous silicon, add silver nitrate, ultrasonically disperse evenly, and let it stand for 2 hours to obtain a mixed solution. The mixed solution was spray-dried at 80°C for 10 hours, and ground to obtain a composite material;

[0035] S3. Pass ethylene into the composite material obtained in step S2 for step sintering, wherein the first gradient sintering temperature in step sintering is 200°C, and the time is 3h; the second gradient sintering temperature is 900°C, and the time is 2h, that is have to.

Embodiment 3

[0037] A method for preparing a carbon-coated silicon / metal / carbon nanotube negative electrode composite material, comprising the steps of:

[0038] S1. Etching the nano-silicon powder with a hydrofluoric acid solution for 6 hours to obtain porous nano-silicon;

[0039] S2, ultrasonically dispersing the porous nano-silicon obtained in step S1 in the multi-walled carbon nanotube solution, ultrasonically oscillating to disperse the carbon nanotubes in the porous silicon, adding silver nitrate, ultrasonically dispersing evenly, and standing for 2 hours to obtain a mixed solution, and The mixed solution was spray-dried at 120°C for 8 hours, and ground to obtain a composite material;

[0040] S3. Passing a mixed gas of acetylene and methane into the composite material obtained in step S2 for step sintering, wherein the first gradient sintering temperature in the step sintering is 400° C., and the time is 3 hours; the second gradient sintering temperature is 900° C., The time is 3h...

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Abstract

The invention discloses a method for preparing a carbon-coated silicon / metal / carbon nanotube negative electrode composite material, comprising the following steps: S1, etching nano-silicon powder with an inorganic acid solution to obtain porous nano-silicon; S2, step The porous nano-silicon obtained in S1 is added to the carbon nanotube solution, ultrasonically oscillated to disperse the carbon nanotubes in the porous nano-silicon, add metal salt, ultrasonically disperse evenly, and stand still to obtain a mixed solution, which is spray-dried and ground Obtaining a composite material; S3, passing a carbon-containing reducing gas into the composite material obtained in step S2 for stepwise sintering, to obtain. The invention also discloses a carbon-coated silicon / metal / carbon nanotube negative electrode composite material and its application. The invention combines carbon nanotubes and metal salts with nano-silicon to enhance the binding force between silicon particles and binders, ensure the transmission of electrons and ions, improve the cycle performance of silicon negative electrode materials, and have simple process and low cost. , suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon-coated silicon / metal / carbon nanotube negative electrode composite material and a preparation method. Background technique [0002] With the increasing needs of human beings and the rapid development of electric vehicles, lithium-ion batteries are the latest generation of secondary batteries with high energy density, high operating voltage, fast charging rate, long cycle life, small self-discharge (5%), and environmental protection. The advantages of friendly, safe and stable performance can well meet the above environmental protection and high performance requirements. Therefore, it has greatly promoted the research of lithium-ion batteries with high energy density and high power density by researchers from various countries. Due to the low theoretical specific capacity (372mAh / g) of the current practical lithium-ion battery anode material graphite, the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/626H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 刘超辉林少雄许家齐
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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