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Carbon-coated foamed aluminium compound and preparation method thereof, current collector and filtering material

A foamed aluminum and composite technology, applied in the field of materials, can solve the problems of uncontrollable activity, poor mechanical strength, narrow electrochemical window, etc., and achieve the effect of improving interface contact effect, improving mechanical strength, and reducing contact resistance.

Inactive Publication Date: 2019-05-21
ZHONGTIAN ENERGY STORAGE TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above, it is necessary to provide an improved carbon-coated aluminum foam composite, which overcomes the shortcomings of poor mechanical strength, uncontrollable activity, and high density (not easily suspended in fluid) of through-hole porous aluminum, and can be used for electrochemical storage. In the energy field, the mechanical strength of the porous aluminum current collector is poor, the electrochemical window is narrow, and the application range is limited.

Method used

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  • Carbon-coated foamed aluminium compound and preparation method thereof, current collector and filtering material
  • Carbon-coated foamed aluminium compound and preparation method thereof, current collector and filtering material
  • Carbon-coated foamed aluminium compound and preparation method thereof, current collector and filtering material

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preparation example Construction

[0045] see figure 1 and figure 2 , the present invention relates to a kind of preparation method of carbon-covered aluminum foam composite, comprising the following steps:

[0046]The aluminum foam is treated at 300-700°C with a carbon source, or a gas containing a carbon source and a nitrogen source for 0.1-3 hours to form a uniform and dense carbon layer on the surface of the aluminum wire skeleton; then a weak oxidant is passed through at 500- Treat at 600°C for 1-24 hours to create pores in the carbon layer to obtain a composite in which the microporous carbon layer is coated on the surface of foamed aluminum (such as figure 1 As shown, the coated carbon layer has a microporous structure, and the rest is tightly coated);

[0047] in,

[0048] The carbon source is CO, C 1 -C 9 Hydrocarbon, C 1 -C 6 One or more of alcohols, ethers, ketones or esters; when the gas containing carbon sources and nitrogen sources is introduced, the nitrogen sources are one or more of org...

Embodiment 1

[0058] Put aluminum foam particles with a diameter of 0.2 mm and a porosity of 50% into a reaction furnace, and at 550° C., feed gas containing carbon source and nitrogen source (C 5 -C 9 Hydrocarbon, ammonia, and hydrogen, the mixture of argon, volume fraction is respectively 87%, 3%, 5%, 5%) After 2 hours, stop passing through carbon source and nitrogen source. Cool down to 500°C and pass H 2 O for 24 hours, at room temperature, under the protection of nitrogen, the resulting product was taken out to obtain a foamed aluminum-carbon composite with a dense carbon-coated layer of microporous structure. The thickness of the carbon layer is 300 nm. In this product, SP 2 The carbon mass fraction of hybridization is 80%, and the rest is SP 3 hybridized carbon. The pore volume of the carbon layer is 2ml / g.

[0059] Compared with non-carbon-coated products (wall thickness of hollow aluminum wire is 7-100 μm, porosity 85-99%, tensile strength 0.4-2MPa, compressive strength 1-3.5...

Embodiment 2

[0061] Put the foamed aluminum block with a length, width and height of 2-200mm and a porosity of 80% into the reaction furnace, and feed the carbon source and nitrogen source gas at 600°C (C 1 -C 4 Hydrocarbon, C 1 -C 7 Organic amines, C 3 -C 6 The mixture of ketone, hydrogen and argon, the volume fractions are respectively 20%, 10%, 40%, 25%, 5%) for 2 hours, and then the carbon source and nitrogen source are stopped. Maintain 600°C with CO 2 After 1 hour, the resulting product was taken out under nitrogen protection at room temperature to obtain a foamed aluminum-carbon composite with a dense carbon-coated layer with a microporous structure. The thickness of the carbon layer is 20 nm. In this product, SP 2 Hybridized carbon mass fraction is 88%, the rest is SP 3 hybridized carbon. The pore volume of the carbon layer is 0.3ml / g.

[0062] Compared with the above-mentioned non-carbon-coated products, the tensile and compressive strengths of the carbon-coated aluminu...

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Abstract

The invention provides a carbon-coated porous aluminum compound. The compound is of a coated core-shell structure, the core body is foamed aluminium formed by an aluminum wire skeleton and a three-dimensional communication hole, the shell layer is a carbon layer having a plurality of micropores, the carbon layer is uniformly coated on the surface of the aluminum wire skeleton, and the carbon layerhas a thickness of 0.34 nm to 5 um. In the carbon-coated porous aluminum compound provided by the invention, the foamed aluminium is formed by the aluminum wire skeleton and the three-dimensional communication hole, the surface of the aluminum wire skeleton is uniformly and densely coated with a thin carbon layer having a thickness of nanometer to several micrometers to avoid formation of an oxide film, and compared with the conventional porous aluminum material, the mechanical strength is effectively improved; when being used as an electrochemical energy storage current collector, the contact resistance with an electrode material can be reduced; and the microporous structure carbon layer can not only function to improve the conductivity and improve interface contact effect, but also hasenergy storage and active substance fixation functions, thereby improving the stability of an electrochemical energy storage device.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a carbon-coated aluminum foam composite, a preparation method thereof, a current collector and a filter material. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Aluminum-based materials are light in weight, high in weight, and excellent in performance. They are widely used in industry, mainly including various electrical conduction, heat dissipation, sound insulation, and mechanical applications (such as cushioning, weight reduction, and strength support). At the same time, the preparation of aluminum into a porous film-like material can be used as a current collector for various energy storage devices, which is of great value in the field of electrochemical energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01G11/68H01G11/70B01D39/06
CPCY02E60/10
Inventor 骞伟中金鹰崔超婕缪永华杨周飞杨智皋张抒婷张刚
Owner ZHONGTIAN ENERGY STORAGE TECH
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