A strategy for constructing 3D ordered boron nitride aerogels-based thermally conductive phase change composites for battery thermal management

Phase change materials(PCMs)have great potential in thermal energy management,but their low ther-mal conductivity,easy leakage,and poor thermal stability limit their wide application.After constructing the biomimetic leaf-vein-like three-dimensional(3D)structure of boron nitride(BN)and impregnated with polyethylene glycol(PEG),the comprehensive properties of phase change composites were effec-tively enhanced under low filler content.The PEG is stored in the 3D structure of BN,which can prevent leakage at high temperatures and enhance the composites’thermal stability and storage modulus.As a fast channel of transmission of phonons,the BN skeleton can effectively reduce thermal resistance.When the amount of filler is 10 vol%,the highest thermal conductivity of the composite PCMs is 2.62 W m-1 K-1,which is 10.1 times than that of pure PEG.Under the infrared camera,the composite PCMs yielded excellent battery thermal management performance,indicating that the material has great potential in thermal management.