High thermal conductivity and high energy density compatible latent heat thermal energy storage enabled by porous AlN ceramics composites

Research output: Contribution to journalArticlepeer-review


  • Xianglei Liu
  • Haolei Wang
  • Qiao Xu
  • Qingyang Luo
  • Yanan Song
  • Yang Tian
  • Meng Chen
  • Yimin Xuan
  • Yi Jin
  • Yixuan Jia

Colleges, School and Institutes

External organisations

  • Nanjing University of Aeronautics and Astronautics
  • Ministry of Industry and Information Technology
  • Jiangsu Jinhe Energy Technology Co. LTD


Ceramics embedded phase change materials (PCMs) composites are promising candidates for high-temperature thermal energy storage due to good chemical stability and high thermal shock resistance. However, the energy storage rate is severely restricted by the low thermal conductivity of composites. Here, we successfully achieve high thermal conductivity and high energy density compatible thermal energy storage based on porous AlN-eutectic NaCl/LiNO3 composites. Designed composites possess a high thermal conductivity ranging from 31.8 to 52.63 W/m-K benefiting from continuous thermal transport channels of densified AlN skeletons. Meanwhile, the phase change enthalpy reaches 140 to 186 kJ/kg since about up to 92% of pores are filled with PCMs. Further decorating AlN skeletons with TiN nanoparticles can significantly increase the solar absorptance from 70% to 90%, enabling proposed composites to be applicable for direct solar thermal energy storage as well. This work provides new routes to achieve high thermal conductivity and energy density compatible thermal energy storage via porous AlN ceramics-based phase change composites.

Bibliographic note

Funding Information: This work is mainly supported by National Key R&D Program of China (No. 2018YFA0702300 ) and National Natural Science Foundation of China (No. 51820105010 and 52076106 ). Publisher Copyright: © 2021


Original languageEnglish
Article number121405
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Early online date11 May 2021
Publication statusE-pub ahead of print - 11 May 2021


  • Energy storage density, porous AlN ceramics, Solar absorption, Thermal conductivity, Thermal energy storage