Preparation method of high-thermal-conductivity porous composite material for loading phase-change material

Abstract

The invention discloses a preparation method of a high-thermal-conductivity porous composite material for loading a phase-change material, which comprises the following steps: mixing layered solid powder such as clay mineral, graphite and hexagonal boron nitride in proportion to prepare a water/ethanol suspension, performing ultrasonic-sanding stripping to form nano-lamellas, adding a proper amount of binding agent to promote self-assembly of the nano-lamellas, and preparing the high-thermal-conductivity porous composite material for loading the phase-change material. And carrying out freeze drying or spray drying to form the micro-nano multistage porous composite material composed of a plurality of components. The porous composite material is subjected to surface treatment and then compounded with paraffin, alkane and other phase change material components through mechanochemistry, melting and other processes, and the phase change material is prepared. The invention has the following beneficial effects: (1) the loading capacity of the effective phase change component is larger; (2) the heat conductivity coefficient is adjustable and can be greatly improved; and (3) the stability and the service life of the phase change material in the use process can be greatly improved and prolonged.

Description

technical field [0001] The invention relates to the technology in the field of non-metal porous composite materials, in particular to a preparation method of a high thermal conductivity porous composite material for supporting phase change materials. Background technique [0002] With the rapid development of electric vehicles and 3C electronic products, the use of lithium batteries is increasingly widespread. The charging and discharging characteristics of lithium batteries can be greatly affected by temperature, especially for fast-charging lithium battery devices. If the local temperature is too high, it will bring security risks, and if the temperature is too low, it will affect the charge and discharge capacity and negatively affect the service life of the battery. The use of thermal management technologies such as cooling and heating is a general idea to solve the above problems. Conventional air cooling, water cooling, electric heating and other technologies have pr...

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Problems solved by technology

[0003] Aiming at the existing problems of single carrier structure for phase change materials, low loading capacity of effective components, low thermal conductivity, instability and easy leakage, etc., the present invention aims at the deficiencies existing in the prior art, and its main purpose is to provide a carrier for phase change materials Use the preparation method of high thermal conductivity porous composite material, which has high thermal conductivity, high load capacity, and high stability as the carrier of phase change materials, and develop an efficient and simple preparation method to overcome the shortcomings of the existing technology