Impregnation of Phase Change Materials (PCMs) into a porous medium is a promising way to stabilize their shape and to improve the thermal conductivity, which are essential for thermal energy storage and thermal management applications, such as electronic devices or batteries. It has attracted many researchers to study in this filed and a lot of porous medium have been designed and investigated. However, the composite phase change materials still face the energy density and anti-leakage capability antagonistically coupled, which limited the PCMs applied in large scale. In this work, we adopted a new calcination method at a lower temperature to prepared the porous AlN@C medium as a supporting material to stabilized the paraffin. The SEM and BET results indicated the AlN@C with a hierarchical macro-nanoporous structure, which have large PCMs loading capability and favourable capillary adsorption. The composite PCMs showed a high paraffin loading (53-62 wt%), and constant thermal response after 100 heating-cooling cycles. The infrared thermal response and thermal conductivity test showed the composite PCMs has good thermal transfer properties. The leakage test indicated the composite PCMs showed good shape-stabilized properties. This work might provide a facile method for synthesizing high-efficient porous medium, which can shape-stabilize the phase change materials with potential applications in the thermal energy storage and thermal management.

Phase change material, thermal energy storage, porous material, anti-leakage