Expanded graphite-binary organic low-temperature nano phase change energy storage material and preparation method and application thereof

Abstract

The invention discloses an expanded graphite-binary organic low-temperature nano phase change energy storage material and a preparation method and application thereof. The preparation method comprisesthe following steps of: stirring an n-tetradecane and dodecanol organic phase change material through a high-shear dispersion emulsification homogenizer to form a binary organic low-temperature nanophase change energy storage material; adding the binary organic low-temperature nano phase-change energy storage material into expanded graphite at normal temperature and normal pressure to obtain a composite material, and measuring the heat conductivity coefficient of the energy storage material to be 2.027-2.407 W/(m.K) by using a heat conductivity coefficient instrument; and measuring the phasechange temperature of the energy storage material by a differential scanning calorimeter to be 3.8-4.5 DEG C and the phase-change latent heat to be 201.8-210.2 J/g. The expanded graphite only plays arole in heat conduction in the energy storage process, and as the expanded graphite-binary organic low-temperature nano phase-change energy storage material is good in compatibility, the degree of supercooling hardly exists, and the melting process and the solidification process are shortened.

Description

technical field [0001] The invention relates to the technical field of composite functional materials, in particular to an expanded graphite-binary organic low-temperature nano phase change energy storage material and its preparation method and application. Background technique [0002] Phase change material technology is a high-tech based on phase change energy storage materials. Because of its high energy storage density and stable output temperature and energy, it has the incomparable advantages of sensible heat storage. Therefore, the research of phase change materials It is becoming more and more widespread, and some phase change materials have also been commercialized, but people have not made breakthroughs in the research on the stability and reliability of phase change materials with high latent heat. At present, organic phase change materials and inorganic phase change materials Materials are widely used. Inorganic phase change materials have high latent heat densit...

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Problems solved by technology

[0006] The above two methods can greatly improve the thermal conductivity of energy storage materials, but there are also some shortcomings: although adding nano-metal particles can increase the thermal conductivity of phase change materials, energy storage materials and thermal conductivity materials have different densities, and must be added during use. The dispersant makes the thermal conductive material fully dispersed, but with the cycle of energy storage and energy release, the function of the dispersant will gradually fail, resulting in layering between the energy storage material and the thermal conductive material due to different densities, and the thermal conductivity is gradually weakened. The added dispersant It also reduces the energy storage density and reduces the latent heat of phase change of energy storage materials; while the cost of metal foam is high, and the pore size of metal foam is large, and the phase change material is prone to leakage during the melting process, resulting in a decrease in the latent heat of phase change, and the phase change The material cannot be 100% fused with the metal foam, which further reduces the energy storage density