固-固相变储热材料的研究进展

与固-液相变材料相比，固-固相变材料（SS-PCMs）受到的关注较少；鉴于SS-PCMs具有储能密度高、无毒且腐蚀性小、相变时无液体产生且体积变化较小、不易发生相分离以及过冷度小等优点，因而是一类具有发展潜力的相变材料。本文基于SS-PCMs的研究现状，对近年来几类重要SS-PCMs如多元醇SS-PCMs、高分子类SS-PCMs及无机盐类SS-PCMs的研究进展进行了综述。简要阐述了SS-PCMs的分类以及各类SS-PCMs的性能、相变储热机制和优缺点。同时介绍了选择固-固相变材料应用时的基本原则，并针对相变材料热导率低，过冷度大、稳定性差等问题的改性研究进行了综述，还简要综述了SS-PCMs的应用研究。最后指出，未来的研究应着眼于解决已合成SS-PCMs的缺陷，开发多功能的SS-PCMs，并在SS-PCMs的实际应用方面实现突破。

Research progress of solid-solid phase change materials for thermal energy storage

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 summarized 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 were briefly described. Meanwhile, the basic principles of selecting solid-solid phase change materials for application were introduced, and the modification studies on the problems of low thermal conductivity, large supercooling and poor stability of phase change materials were reviewed. The application research of SS-PCMs was also briefly reviewed. Finally, the article pointed 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.