研究了3种沉淀剂对合成SiO₂基复合相变微胶囊的形貌特征和相变储热性能的影响。通过红外光谱仪(FT-IR)、X射线衍射仪、导热系数测定仪等对SiO₂基复合相变微胶囊的组成、结构和导热性能进行分析。结果表明,正十八烷与SiO₂壳材仅是物理结合,两者并未发生化学反应;当沉淀剂为盐酸时所制备的SiO₂基复合相变微胶囊分散性良好,包覆率和储能效率可达69%,导热系数提高近50%。SiO₂基复合相变微胶囊对锂离子电池组热管理测试结果表明,微胶囊能有效控制电池组的表面温度,且温度波动范围小。

The effects of three kinds of precipitant on the morphology and heat storage properties of SiO₂ based composite microcapsules are studied.The composition,structure and thermal conductivity of SiO₂ composite phase change microcapsules are analyzed through infrared spectrometer FT-IR,X-ray diffractometer,thermal conductivity tester and other characterization methods.Results show there is physical combination only between noctadecane and SiO₂ shell,without chemical reaction happening.SiO₂ composite phase change microcapsules prepared with hydrochloric acid as the precipitator have good dispersion performance,both their coating rate and energy storage efficiency can reach 69%,and the thermal conductivity can be increased by nearly 50%.Thermal management test for Li-ion battery with SiO₂-based composite phase change microcapsules shows that the microcapsules can effectively control the surface temperature of the battery pack,and the temperature fluctuation range is small.

谭俊华(1982-),女,硕士,副教授,研究方向为相变储能材料,通讯联系人,junhua_tan@163.com。