Preparation method of graphene-carbon nanotube aerogel supported nano-silicon composite electrode material

A technology of carbon nanotubes and composite electrodes, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of loss of electrical contact, poor conductivity, volume change, etc., and achieve the effects of increasing contact, improving conductivity, and increasing specific capacity

Active Publication Date: 2016-05-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the reason why silicon anode materials have not been commercialized is that silicon has a huge volume change during charging and discharging, and silicon gradually shatters and falls off the current collector, thereby losing electrical contact.
In addition, silicon is a semiconductor, and its own conductivity is poor. When used as an electrode, conductive additives need to be added

Method used

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  • Preparation method of graphene-carbon nanotube aerogel supported nano-silicon composite electrode material
  • Preparation method of graphene-carbon nanotube aerogel supported nano-silicon composite electrode material
  • Preparation method of graphene-carbon nanotube aerogel supported nano-silicon composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Preparation of graphite oxide:

[0033] Get 10g (8000 order) natural flake graphite and 500ml mass concentration be 98% sulfuric acid after mixing uniformly, add 10.0g potassium nitrate, add 60g potassium permanganate rapidly in the water bath of 15 ℃, mix uniformly. Then the temperature of the system was raised to 40°C, reacted for 3h, then added 300ml of water, and simultaneously the system was heated to 80°C for 30min, then the excess potassium permanganate was reduced with 500ml of distilled water and 100ml of hydrogen peroxide (30wt%), and centrifugally washed to The pH was 5, and the graphite oxide solid was obtained by vacuum drying at 40°C.

[0034] 2) preparation of graphene oxide aqueous solution:

[0035] Weigh 30 mg of graphite oxide solids and disperse them in 300 ml of water to prepare a graphite oxide suspension with a mass concentration of 0.1 mg / ml. Ultrasonic the suspension for 0.5 h at a frequency of 20 kHz to achieve single-layer peeling and obta...

Embodiment 2

[0041] 1) Preparation of graphene oxide aqueous solution:

[0042] Weigh 30 mg of the graphite oxide solid prepared in Example 1 and disperse it in 30 ml of water, and prepare a graphite oxide suspension with a mass concentration of 1 mg / ml, and ultrasonicate the suspension for 1 h at a frequency of 20 kHz to realize single-layer peeling, and obtain Uniform and stable graphene oxide dispersion.

[0043] 2) Preparation of nano-silicon composite electrode materials supported by graphene and carbon nanotube airgel:

[0044] 60 ml of 1 mg / ml nano-silicon dispersion and 5 ml of 1 mg / ml multi-walled carbon nanotube dispersion were prepared respectively, and 0.5 mg of sodium dodecylbenzenesulfonate was added to the carbon nanotube dispersion. At a frequency of 30 kHz, the two dispersions were ultrasonicated for 2 h to uniformly disperse nano-silicon and carbon nanotubes. Then add the dispersed nano-silica powder solution and carbon nanotube solution to 30ml1mg / ml graphene oxide sol...

Embodiment 3

[0048] 1) Preparation of graphene oxide aqueous solution:

[0049] Weigh 30 mg of the graphite oxide solid prepared in Example 1 and disperse it in 15 ml of water, and prepare a graphite oxide suspension with a mass concentration of 2 mg / ml. The suspension is sonicated for 2 h at a frequency of 40 kHz to realize single-layer peeling, and obtain Uniform and stable graphene oxide dispersion.

[0050] 2) Preparation of nano-silicon composite electrode materials supported by graphene and carbon nanotube airgel:

[0051] Prepare 30ml of 2mg / ml nano-silicon dispersion and 7.5ml of 2mg / ml single-wall and multi-wall carbon nanotube dispersion respectively, and add 0.3mg of cetyltrimethylammonium bromide to the carbon nanotube dispersion. At a frequency of 40 kHz, the two dispersions were ultrasonicated for 3 h to uniformly disperse nano-silicon and carbon nanotubes. Then nano-silica powder solution and single-wall, multi-wall carbon nano-carbon nanotube solution are added to the gra...

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PUM

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Abstract

The invention relates to a preparation method of a graphene-carbon nanotube aerogel supported nano-silicon composite electrode material. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid, respectively preparing nano-silicon and a carbon nanotube dispersion liquid, carrying out ultrasonic dispersion, adding a surfactant to the carbon nanotube dispersion liquid, adding the nano-silicon and the surfactant-containing carbon nanotube dispersion liquid to the graphene oxide dispersion, carrying out ultrasonic dispersion to obtain a uniformly mixed dispersion liquid, freeze-drying the uniformly mixed dispersion liquid, calcining the obtained dried powder in protection atmosphere, and naturally cooling the calcined powder to obtain the graphene-carbon nanotube aerogel supported nano-silicon composite electrode material. The composite electrode material prepared in the invention has the advantages of high capacity, high efficiency, good cycle performances and high safety; and the method is simple, is easy to implement, and is suitable for industrial large-scale production.

Description

Technical field: [0001] The present invention relates to a preparation method of lithium-ion battery negative electrode materials, in particular to a preparation method of lithium-ion battery graphene-carbon nanotube airgel-supported nano-silicon composite electrode materials, belonging to high-capacity, high-efficiency lithium-ion battery negative electrode materials Preparation. Background technique: [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, environmental protection and no pollution, and no memory effect. They have been widely used in portable electronic devices such as mobile phones, notebook computers, and cameras. In recent years, with the rapid development of many emerging technology industries such as electric vehicles, aerospace, and energy storage systems, there are also higher requirements for high-performance secondary lithium-ion batteries, requiring lithium-ion batteries to have larger sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393
CPCY02E60/10
Inventor 暴宁钟白凤娟何大方
Owner NANJING UNIV OF TECH
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