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Three-dimensional graphene/phase change energy storage composite material and preparation method thereof

A phase-change energy storage material and phase-change energy storage technology, which is applied in the field of three-dimensional graphene/phase-change energy storage composite materials and its preparation, can solve the problems of low thermal conductivity, achieve low thermal expansion coefficient, prevent seepage, and improve The effect of heat transfer efficiency

Inactive Publication Date: 2012-07-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a three-dimensional graphene / phase change energy storage composite material for thermal management of electronic devices to solve the problem of low thermal conductivity of phase change energy storage materials in the prior art

Method used

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  • Three-dimensional graphene/phase change energy storage composite material and preparation method thereof
  • Three-dimensional graphene/phase change energy storage composite material and preparation method thereof
  • Three-dimensional graphene/phase change energy storage composite material and preparation method thereof

Examples

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preparation example Construction

[0037] see figure 1 , the preparation method of the three-dimensional graphene / phase change energy storage composite material provided by the invention comprises:

[0038] Using metal foam 1 as a template, growing three-dimensional graphene by CVD to obtain the operation A of graphene / metal foam composite 2;

[0039] Compositing the graphene / metal foam composite obtained in the process A with the melted phase-change energy storage material by vacuum impregnation to form a composite 3 of graphene / metal foam / phase-change energy storage material;

[0040] Step C of removing metal foam from the composite of graphene / metal foam / phase-change energy storage material prepared in step B to obtain a composite of graphene / phase-change energy storage material;

[0041] The graphene / phase change energy storage material composite in step C is further compounded with the phase change energy storage material by vacuum impregnation to form step D of graphene / phase change energy storage compos...

Embodiment 1

[0049] Adopt CVD method, with nickel foam (see its SEM photo figure 2 ) as a template to prepare a three-dimensional graphene foam (1-3 layers), and obtain a graphene / nickel foam composite system (see the SEM photo of the image 3 , see Table 1 for thermal conductivity);

[0050] Put stearic acid, a phase-change energy storage material, in a vacuum drying oven at 80°C. After the stearic acid is melted, impregnate the graphene / nickel foam above into the stearic acid, and vacuum the system to a degree of 0.09MPa. Keep vacuum state 1 hour, obtain Graphene / nickel foam / stearic acid composite system (its SEM photo sees Figure 4 , see Table 1 for thermal conductivity);

[0051] At room temperature, the above-mentioned graphene / nickel foam / stearic acid composite system was immersed in 65% hydrochloric acid. After 48 hours, after the nickel foam was completely reacted with hydrochloric acid, the sample was taken out, washed with water until neutral, and graphene / stearic acid was ob...

Embodiment 2

[0055] The preparation process and steps in this example are exactly the same as those in Example 1 above. The difference is: lauric acid is selected as the phase change energy storage material, and the test results are shown in Table 1;

[0056] The test results show that the graphene / lauric acid composite system and the graphene / stearic acid composite system have similar thermophysical parameters of thermal conductivity.

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Abstract

The invention provides a three-dimensional graphene / phase change energy storage composite material and a preparation method thereof. The technical scheme is as follows: graphene and a phase change energy storage material are in situ compounded, wherein porous graphene with a three-dimensional structure is used as a heat conductor and a compound die, and a solid-liquid phase change organic material is used as the energy storage material and filler. The three-dimensional porous graphene is compounded with the phase change material, the phase change energy storage material is partitioned in a plurality of pore spaces and is in tight joint with the graphene wall so as to greatly increase the effective heat contact area, and the highly linked graphene three-dimensional heat conduction network channels can realize rapid system heat exchange. In addition, due to the capillary adsorption capacity of porous graphene, the liquid-state phase change energy storage material is localized, so as to effectively prevent seepage. Therefore, the three-dimensional graphene foam has good designability, and becomes a lighter and more effective heat dissipation material for electronic devices.

Description

technical field [0001] The invention relates to the technical field of preparation of graphene composite materials, in particular to a three-dimensional graphene / phase change energy storage composite material and a preparation method thereof. Background technique [0002] In the process of storage and utilization of thermal energy, there are often contradictions between supply and demand in time and space that do not match, such as the intermittent nature of solar energy, the peak-valley difference of electric loads, the heat dissipation of high-power electronic devices that work periodically, and industrial Waste heat utilization, etc. Phase change energy storage materials absorb or release a large amount of heat when the material undergoes a phase change to realize energy storage and utilization, which can effectively solve the contradiction between energy supply and demand in terms of time and space. Therefore, phase change energy storage technology is widely used in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 黄富强仲亚娟陈剑万冬云毕辉
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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