Preparation and Properties of Paraffin-Based Core-Shell Phase Change Energy Storage Composites

The core component (EG-Paraffin) was obtained by impregnation of Paraffin in expanded graphite (EG), and the shell component (Ep-Paraffin@SiO₂) was obtained by filling the obtained Paraffin@SiO₂ microcapsules into epoxy resin. The EG-Paraffin/Ep-Paraffin@SiO₂ phase change composite with macroscopic core-shell structure was prepared by simple molding. The experimental results showed that the macroscopic core-shell structure endowed the phase change composite with excellent leak-proof performance and shape stability. The microcapsules in the shell component maintained a high enthalpy (greater than 144 J/g) of the phase change composite. On the one hand, EG in the core component could encapsulate the paraffin effectively; On the other hand, the heat transfer rate of the phase change composites could be greatly improved. The excellent comprehensive performance of this phase change composite had great application potential in the field of thermal energy storage and thermal management.