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A graphene-based composite phase change material with hierarchical thermal conductivity structure and preparation method thereof

A technology of composite phase change material and thermal conduction structure, applied in the field of graphene-based composite phase change material and its preparation, can solve the problems of loose structure, weak interaction of thermal conduction materials, limited thermal conduction efficiency of skeleton, etc., and achieve high enthalpy retention. rate, the effect of improving thermal response performance

Active Publication Date: 2022-05-17
山东国烯新材料创新中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current thermally conductive skeleton, the interaction between the thermally conductive materials is weak, and the contact thermal resistance is still very high due to the loose structure. The thermal conductivity of the skeleton is limited, and the thermal conductivity of the thermally conductive material cannot be fully utilized.

Method used

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  • A graphene-based composite phase change material with hierarchical thermal conductivity structure and preparation method thereof
  • A graphene-based composite phase change material with hierarchical thermal conductivity structure and preparation method thereof
  • A graphene-based composite phase change material with hierarchical thermal conductivity structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 50.0 g of graphene oxide dispersion liquid with a concentration of 0.5 wt%, add 500 mg of graphene nanosheets, stir at room temperature at 1000 rpm for 1 hour, and obtain graphene nanosheets / graphene oxide slurry.

[0026] (2) Lay the two-dimensional graphene film with high thermal conductivity and the graphene nanosheet / graphene oxide slurry layer by layer, and control the distance between the layers of the two-dimensional graphene film with high thermal conductivity to be 1mm. The paved samples were frozen in a liquid nitrogen (-196°C) environment for 15 minutes, and then dried in a freeze dryer for 70 hours to obtain a porous skeleton with a hierarchical thermal conductivity structure. The freeze-drying temperature was -60°C and the pressure is 30Pa.

[0027] (3) Heating the solid paraffin to 80° C. until it is completely liquefied, immersing the porous skeleton obtained in step (2) in the liquefied paraffin, and raising the vacuum degree of the immersion en...

Embodiment 2

[0031] According to Example 1, the thermally conductive filler graphene nanosheets in Step (1) of Example 1 are changed to single-layer graphene, and the addition amount is changed to 1000 mg, and the rest are the same as in Example 1 to obtain a fast-response compound with a hierarchical thermal conductivity structure. phase change material. The paraffin loading is 72.1wt%, the directional thermal conductivity is 40.5W / m.K, the phase transition enthalpy is 155J / g, and the phase transition temperature is 40°C.

Embodiment 3

[0033] According to Example 1, the layer spacing of the high thermal conductivity graphene two-dimensional film in Step (2) of Example 1 is changed to 0.5mm. The rest are the same as in Example 1, and a fast-response composite phase-change material with a hierarchical thermal conductivity structure is obtained. Wherein the paraffin loading is 70.1wt%, the directional thermal conductivity is 50.3W / m.K, the phase transition enthalpy is 152J / g, and the phase transition temperature is 40°C.

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Abstract

The invention is a graphene-based composite phase change material with a hierarchical heat conduction structure. The composite material is obtained by impregnating an organic phase change material with a hierarchical heat conduction structure composed of a two-dimensional graphene film with high thermal conductivity and a three-dimensional graphene heat conduction network as a skeleton. Compared with the existing phase change materials, the composite phase change material solves the contradiction between high thermal conductivity and high enthalpy, the thermal response performance is greatly improved, the thermal conductivity is increased by 160 times and the phase change material can maintain more than 70% The enthalpy value can greatly promote the application of phase change materials in temperature management, energy dispatching and other fields.

Description

technical field [0001] The invention belongs to the field of energy storage composite materials, and in particular relates to a graphene-based composite phase change material with a hierarchical heat conduction structure and a preparation method thereof. Background technique [0002] Phase change energy storage materials can absorb or release a large amount of heat energy during the phase change process, while the temperature remains basically stable near the phase change point. The corresponding energy storage method is also called latent heat storage. In contrast, sensible heat storage refers to a certain amount of heat absorbed or released by materials during the heating and cooling process, with low energy storage density and large temperature changes. From the perspective of heat storage density and volume change rate, organic "solid-liquid" phase change materials are currently the most studied and used type, but organic phase change materials have inherently low therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14Y02P20/10
Inventor 李宜彬
Owner 山东国烯新材料创新中心有限公司
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