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.
precipitantSiO2 composite phase change microcapsulesphase change energy storage propertythermal management
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