Abstract: In order to improve the thermal conductivity and thermal stability of phase-change energy storage material,a novel form-stable composite PEG/SiO2-Ni phase change material with enhanced thermal conductivity is prepared through sol-gel and vacuum impregnation methods,with polyethylene glycol (PEG),SiO2 and foam nickel as raw materials.The properties of the prepared material are characterized.Results indicate that the thermal conductivity of this composite phase change material reaches 0.57 W/(m·K) due to the adding of foam nickel,which has an increase of 96.6% compared with that of PEG/SiO2 phase change material.In the meantime,the time that PEG/SiO2-Ni spends in storing heat is shortened by 63.4% compared with that of PEG/SiO2.The structural strength and heat charging-discharging rate of PEG/SiO2-Ni are improved effectively.What's more,PEG/SiO2-Ni exhibits preferably form-stable performance,structural stability and high phase change latent heat.
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