▎ 摘　　要

Graphene-based composites show great potential in the development of lightweight functional devices and systems, and polymers are usually used as binders to enhance the mechanical properties of these composites. Due to the low thermal conductivity of the polymer and the high inherent interfacial thermal resistance between polymer and graphene, however, the developed devices and systems generally possess low thermal conductivity, which seriously limits their further thermal-related applications. Here, a lightweight two-phase heat transport device (TPHTD) based on a vapor-liquid phase transition-based heat transfer by using a graphene-based composite material as the casing is generated. The graphene-based TPHTD has high thermal conductivity of up to 1408 W (mK)(-1) and realizes ultra-high specific thermal conductivity of approximate to 5600 W (mKg)(-1). This graphene-based device with lightweight and high heat transfer capacity offers new opportunities for efficient thermal management of compact, portable, or wearable electronic and power systems.