关键词: 关键词：储热技术, 潜热储热, 固-固相变材料, 相变储热机制, 导热系数, 过冷度, 稳定性

Abstract: Abstract:Compared with solid-liquid phase change materials, solid-solid phase change materials (SS-PCMs) have received less attention. SS-PCMs is a type of phase change material with development potential as they possess the advantages of high energy storage density, non-toxic and low corrosion, no liquid generated and small volume change during phase change, low phase separation, and low supercooling. Based on the current research status of SS-PCMs, this paper summarizes the research progress of several important SS-PCMs such as polyol SS-PCMs, polymer SS-PCMs and inorganic salts SS-PCMs in recent years. The classification of SS-PCMs and the performance, heat storage mechanism, advantages and disadvantages of various SS-PCMs are briefly described. Meanwhile, the basic principles of selecting solid-solid phase change materials for application are introduced, and the modification studies on the problems of low thermal conductivity, large supercooling, and poor stability of phase change materials are reviewed. The application research of SS-PCMs is also briefly reviewed. Finally, the article points out that future research should focus on solving the defects of synthesized SS-PCMs, developing multi-functional SS-PCMs, and making breakthroughs in the practical application of SS-PCMs.

Key words: Keywords：heat storage technology, latent heat storage, solid-solid phase change material, phase change heat storage mechanism, conductivity, supercooling, stability