High-thermal conductivity fast-response phase change energy-storage composite material and preparation method thereof

A composite material and phase change energy storage technology, applied in the field of high thermal conductivity and fast response phase change energy storage composite materials and their preparation, can solve the problems of low thermal conductivity and slow response speed, and achieve high thermal conductivity and improved response speed. , the effect of improving thermal conductivity

Pending Publication Date: 2019-05-03
日照市烯创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of slow response speed and low thermal conductivity of the traditional phase change energy storage materials mentioned above, the present invention proposes a fast response speed, h

Method used

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  • High-thermal conductivity fast-response phase change energy-storage composite material and preparation method thereof
  • High-thermal conductivity fast-response phase change energy-storage composite material and preparation method thereof
  • High-thermal conductivity fast-response phase change energy-storage composite material and preparation method thereof

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specific Embodiment approach 1

[0039] Specific Embodiment 1: This embodiment describes a high thermal conductivity and fast response phase change energy storage composite material. The composite material is composed of a high thermal conductivity and highly oriented graphene network structure as a skeleton, impregnated with an organic phase change material. Compared with traditional phase change materials, the phase change energy storage composite material of the present invention has an order of magnitude higher thermal conductivity, which can reach 180W / m·K. The thermal conductivity is high, and heat can be quickly transferred to phase change materials (paraffin wax etc.), so the phase change response speed is fast; the high orientation is aimed at the graphene network structure. Graphene itself is a two-dimensional material, sheet-like, with good heat conduction along the in-plane direction of the sheet, and poor heat conduction in the direction perpendicular to the sheet, so only using Only when they are...

specific Embodiment approach 2

[0040] Embodiment 2: A method for preparing the high thermal conductivity and fast response phase change energy storage composite material described in Embodiment 1, the method includes the following preparation steps:

[0041] Step 1: Preparation of high thermal conductivity and high orientation graphene network structure and density or porosity control;

[0042] Step 2: impregnating the organic phase change material.

[0043] Specific embodiment three: the preparation method of a high thermal conductivity and fast response phase change energy storage composite material described in specific embodiment two, the step one described is one of the following two methods:

[0044] Method 1: Directional freeze-drying method

[0045](1) Preparation of graphene oxide solutions with different concentrations: Take 5 mg / mL graphene oxide aqueous solution in a centrifuge tube, centrifuge through a centrifuge, take away the supernatant, and obtain 8 ~25mg / mL graphene oxide aqueous soluti...

Embodiment 1

[0060] (1) Preparation of highly oriented graphene network structure by directional freeze-drying method.

[0061] (a) Preparation of graphene oxide solutions with different concentrations: Take 5 mg / mL graphene oxide solution in a centrifuge tube, centrifuge through a centrifuge for 4 times, remove 2 / 3 volume of the supernatant, and obtain 15 mg / mL mL concentration of graphene oxide solution, followed by stirring for 2 hours and ultrasonic vibration for 1 hour to prevent graphene oxide sheets from agglomerating. (b) Freeze-drying: Pour the graphene oxide solution into the mold (the bottom of the mold is made of copper and the surrounding is made of polytetrafluoroethylene), cool down with liquid nitrogen, freeze into a block from bottom to top, and put it into In the freeze dryer, take it out after 7 days to obtain a graphene oxide network structure with graphene oxide oriented along the Z axis, and the density of this structure is 15 mg / cm 3 . (c) Reduction of highly orien...

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Abstract

The invention is a high-thermal conductivity fast-response phase change energy-storage composite material. According to the composite material, a three-dimensional highly-oriented graphene network structure is adopted as the framework, then the framework is impregnated with an organic phase change material so as to obtain the composite material, wherein a preparation method of the highly-orientedgraphene network structure can comprise the steps: performing directional freeze drying on an aqueous graphene oxide solution, performing reduction by using hydrazine hydrate, performing high temperature heat treatment, and performing cold-pressure density regulation, or can comprise the steps: performing cold pressing and molding on graphene powder, and performing high temperature heat treatment.Alkane is adopted by the organic phase change material, and the impregnation process can be ordinary impregnation or vacuum impregnation. When the high-thermal conductivity fast-response phase changeenergy-storage composite material is compared with an existing phase change energy storage composite material, the thermal conductivity is increased by 17 times, the response speed is increased by 20times or above, and effective packaging of phase change matrix can be realized, so that application of the phase change energy storage composite material in multiple fields is promoted.

Description

technical field [0001] The invention belongs to the field of energy storage composite materials, and in particular relates to a phase-change energy storage composite material with high thermal conductivity and fast response and a preparation method thereof. Background technique [0002] When a material undergoes a phase change, it absorbs or releases heat, which is called the latent heat of phase change. Using the latent heat of phase change of the material can not only store the excess energy to achieve the purpose of cooling, but also transfer the stored heat to other places that need heat, which is very important for the thermal management of electronic devices and the rational use of excess heat. Significance. [0003] With the development of information technology, the power density of electronic devices is getting higher and higher, and the volume is getting smaller and smaller, so the heat emitted by electronic devices is getting bigger and bigger. Many electronic co...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 李宜彬
Owner 日照市烯创新材料科技有限公司
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