结晶水合物盐是一类无机相变储能材料，其存在相分离、过冷等现象，无法获得实际应用。通过溶胶-凝胶法制备SiO₂包覆CaCl₂·2H₂O相变纳米复合材料，并通过XRD、EDS、SEM和TEM对样品进行表征。DSC和STA分析结果表明，样品具有良好的储热性能和热稳定性。样品的相变温度为75.8℃，相变焓为52.89 J/g。热循环实验表明其具有良好的热循环性能。水合盐的相分离、过冷现象得到了有效抑制和减轻，这是由于介孔限域效应的作用结果。

Crystalline hydrated salts are a class of inorganic phase change energy storage materials,which cannot be practically applied due to phase separation,overcooling and the like problems.SiO₂ coated CaCl₂·2H₂O phase change nano-composites are prepared by means of sol-gel method.The samples are characterized by XRD,EDS,SEM and TEM.DSC and STA analysis results indicate that the sample has good heat storage performance and thermal stability.The sample can be melted at 75.8℃ with a latent heat of 52.89 J·g^-1.Thermal cycling experiments show that it has good thermal cycling properties.The phase separation and overcooling of the hydrated salt are effectively suppressed and mitigated due to the mesoporous confinement effect.

周龙祥(1992-),男,硕士研究生,研究方向为相变储能微胶囊技术,1662919732@qq.com