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Graphene clad porous granular material and preparation method thereof

A graphene coating, graphene technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low chemical vapor deposition production efficiency, difficult to meet cheap large-scale preparation, poor lithium ion penetration ability, etc. Achieve the effect of avoiding direct contact with silicon, reducing formation, and shortening reaction time

Active Publication Date: 2016-01-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But silicon also faces very serious problems: ① As a semiconductor material, silicon material has far worse conductivity than graphite
②The silicon material is dense, and compared with the relatively fluffy graphite, the penetration ability of lithium ions is poor
However, this scheme uses the method of chemical vapor deposition to grow graphene in situ on the surface of nanometer-sized silicon. Since this process needs to be grown at about 1000 degrees Celsius, the temperature is relatively high. In addition, the chemical vapor deposition has low production efficiency. The method is difficult to meet the requirements of cheap large-scale preparation, and it is difficult to realize commercialization
And the nanoscale coating formed by it has too large specific surface area, and when it is used in lithium-ion batteries, it is easy to cause the first Coulombic efficiency to be small and the practicability is poor.

Method used

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  • Graphene clad porous granular material and preparation method thereof
  • Graphene clad porous granular material and preparation method thereof
  • Graphene clad porous granular material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of silicon-containing alloys

[0044] Put silicon and aluminum into a resistance furnace with a mass ratio of 20:80, heat it to 800°C to melt, and keep it warm for 30 minutes. After the alloy composition is uniform, it is poured into an alloy ingot.

[0045] (2) Preparation of alloy powder

[0046] Put the alloy ingot obtained in step (1) into the ladle at the upper end of the spray deposition powder making equipment, heat it to 800°C to melt and keep it warm for 30 minutes, then open the ladle, and use high-purity nitrogen as the cooling medium in the high-speed atomization equipment Al-Si alloy balls with a diameter of 50 microns were prepared.

[0047] (3) Preparation of graphene-coated porous silicon composites

[0048] Put the silicon alloy balls obtained in step (2) into the graphene oxide aqueous solution with a concentration of 2 mg / mL, and after stirring by magnetic force for 24 hours, add sulfuric acid with a concentration of 1 mole per liter...

Embodiment 2

[0050] (1) Preparation of silicon-containing alloys

[0051] Put silicon and zinc metal into a resistance furnace with a mass ratio of 10:90, heat to 600°C to melt, and keep it warm for 30 minutes. After the alloy composition is uniform, it is poured into an alloy ingot.

[0052] (2) Preparation of alloy powder

[0053] Put the alloy ingot obtained in step (1) into the ladle at the upper end of the spray deposition powder making equipment, heat it to 600°C to melt and keep it warm for 30 minutes, then open the ladle, and use high-purity nitrogen as the cooling medium in the high-speed atomization equipment Al-Si alloy balls with a diameter of 20 microns were prepared.

[0054] (3) Preparation of graphene / silicon composite materials

[0055] Put the silicon alloy balls obtained in step (2) into an aqueous solution of graphene oxide with a concentration of 5 mg / mL, stir magnetically for 24 hours, add sulfuric acid with a concentration of 2 moles per liter, react for 24 hours, ...

Embodiment 3

[0057] The rate discharge performance test of graphene-coated porous silicon was carried out according to routine tests. The result is as Figure 7 shown. The performance of the graphene-coated porous silicon material did not change after 20 cycles.

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Abstract

The invention discloses a graphene clad porous granular material and a preparation method thereof. By utilizing the in-situ reduction action of active metal on graphene oxide, partial reduction of the graphene oxide is realized in graphene oxide aqueous solution as well as cladding on the granular material, and the clad material is alloy grains (such as silicon alloy of aluminum, magnesium, ferrum, nickel and the like), of metal and silicon; moreover, reduction can be performed on the graphene oxide by metal elements; selective etching is performed on metal phases in the alloy grains clad with graphene through dealloying to realize the porous granular material. According to the structure of graphene clad porous silicon obtained by the method disclosed by the invention, not only can direct contact between electrolyte and the silicon be avoided but also the electrical conductivity of the silicon material can be improved, therefore the formation of excessive solid electrolyte thin films is avoided, and the electrochemical performance is improved truly.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials for energy storage devices, in particular to a graphene-coated porous particle material and a preparation method thereof. Background technique [0002] In recent years, due to the smog phenomenon caused by the unrestrained use of traditional energy sources such as oil and coal, it has seriously affected people's health and quality of life. The development and use of new energy sources have attracted more and more attention from the state and society. The core issue of the utilization of new energy is the cheap production, storage and release of new energy. As an intermediate core link in the process of energy use, energy storage is crucial to the use and development of new energy. At present, new energy generation methods mainly include solar cells, wind power generators, biomass power plants and nuclear power plants. The energy generated by these new energy methods is mainly el...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 慈立杰翟伟艾青冯金奎
Owner SHANDONG UNIV
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