Ternary complex aerogel and preparation method and electrode slice preparation technology

A ternary composite and preparation technology, applied in the field of airgel, can solve the problems of difficulty in obtaining uniform products, expensive equipment, and reduced Coulombic efficiency, so as to avoid the decrease of effective density, enhance the electron migration rate, and improve the mechanical properties. Effect

Inactive Publication Date: 2018-07-27
涵谷新能源科技(上海)有限公司
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  • Abstract
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Problems solved by technology

For example, during the charge and discharge process of silicon nanopowder, the nanoparticles spontaneously agglomerate, and the formed high specific surface area system leads to a decrease in Coulombic efficiency.
This problem can be avoided by using CVD method to grow silicon nanowires on the current collector. However, the CVD method is complex, expensive equipment, difficult to control the process, and it is difficult to obtain uniform products. self break

Method used

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  • Ternary complex aerogel and preparation method and electrode slice preparation technology
  • Ternary complex aerogel and preparation method and electrode slice preparation technology
  • Ternary complex aerogel and preparation method and electrode slice preparation technology

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Preparation of negative electrode material: at room temperature, add 100 mg of amorphous silicon powder to 10 ml of anhydrous methanol, ultrasonically vibrate, add 800 μl of APTES silane coupling agent, and magnetically stir for 2 hours to form a suspension;

[0042] The reaction product was collected by centrifugation, washed three times with ethanol, and dried in an oven to obtain surface aminated amorphous silicon.

[0043] Graphene oxide was prepared by the modified Hummers method. First, 2 g of flake graphite and 1 g of sodium nitrate were added to 46 ml of concentrated sulfuric acid, and magnetically stirred in an ice bath (below 20 °C) for 0.5 hours, then potassium permanganate was added, and the stirring was continued for 1 hour. ; Then put the above solution into an oil bath to keep the temperature at 35°C and stir magnetically for 4 hours; then adjust the temperature to about 95°C, slowly add 92ml of water, stir with a glass rod, then adjust the temperature at ...

Embodiment 2

[0055] Preparation of negative electrode material: At room temperature, add 50 mg of amorphous silicon powder to 5 ml of anhydrous methanol, ultrasonically, add 400 μl of APTES silane coupling agent, and stir magnetically for 2 hours to form a suspension; collect the reaction product by centrifugation and wash with ethanol Three times, put it in an oven to dry to obtain amorphous silicon with surface amination. The preparation of graphene oxide is the same as in Example 1. Measure 0.5g of carbon nanotubes, grind, put into a tube furnace and calcined at 600 ° C for 2h; add the calcined product to a mixed acid of 16ml of concentrated nitric acid and concentrated sulfuric acid (volume ratio concentrated sulfuric acid: concentrated nitric acid=3: 1, heated to 80 ℃ and stirred for 6 hours, and repeatedly centrifugally cleaned with deionized water. The acidified carbon nanotube dispersion solution was obtained, and its pH was about 4. Graphene oxide and aminated amorphous silicon we...

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Abstract

The invention discloses a ternary complex aerogel. The aerogel is a three-dimensional porous structure formed by graphene and carbon nanotube. According to the invention, amorphous silicon is embeddedon a graphene sheet layer. The invention discloses a preparation method of the ternary complex aerogel and a preparation technology for an electrode slice. The nano amorphous silicon particles are loaded on the graphene sheet layer, and large volume effect of silicon can be buffered by a three-dimensional connected framework of the three-dimensional graphene aerogel. According to the addition ofthe carbon nanotube, one on hand, the three-dimensional network formed by the carbon nanotube and the graphene sheet layer has pinning and fettering effects for silicon particles, mutual inhibition isrealized, and agglomeration is not easily generated; on the other hand, through electrostatic action or Pi-Pi bond stacking effect, and graphene bonding carbon nanotube, the electron migration rate between the graphene sheet layer apertures can be enhanced; the addition of the carbon nanotube can greatly increase the machinery performance of the aerogel, and the aerogel can employ a compressed tablet method to prepare the self-supporting electrode slice.

Description

technical field [0001] The invention relates to an aerogel, in particular to a silicon graphene carbon nanotube ternary composite aerogel and a preparation method thereof. Background technique [0002] Silicon is considered to be the most potential negative electrode for lithium batteries because of its high theoretical specific capacity (4200mAh / g), low lithium-deintercalation voltage (<0.5V), high safety, abundant reserves and low price. one of the materials. However, the serious volume effect, low electronic conductivity, and unstable surface solid electrolyte (SEI) film of silicon during the charging and discharging process severely limit the practical application of silicon materials. Therefore, suppressing the volume expansion during silicon cycling and improving the transport power of lithium ions and electrons are the key issues to be solved urgently in the research of anode materials for silicon-based lithium batteries. [0003] At present, in view of the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1395H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 宋雪峰韩伟娜李建刚
Owner 涵谷新能源科技(上海)有限公司
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