石墨烯作为吸波材料虽然有低密度、介电损耗大等优点，但是存在由介电常数较大所导致阻抗匹配性差这一瓶颈问题。锂铝硅陶瓷（LAS）具有较低介电常数（ε’=2.78），与石墨烯复合能够显著提高石墨烯的阻抗匹配。更重要的是活性锂离子的引入，使石墨烯中同时存在电子电导和离子电导双重电磁波损耗机制。目前关于电子、离子电导的协同吸波机制尚无报道。本研究拟采用溶胶凝胶方法构建rGO@LAS复合材料，研究LAS微观结构及rGO/LAS界面对rGO@LAS复合材料介电性质的影响规律，揭示锂离子浓度、LAS微观结构和石墨烯掺杂等影响因素与rGO@LAS吸波性能的本质联系，阐明rGO@LAS复合材料离子电导和电子电导损耗的协同吸波机制。本项目实施将为提高石墨烯阻抗匹配、揭示rGO@LAS复合材料吸波机理等方面提供新思路，为开发轻质、强电磁波吸收的介电损耗型吸波材料奠定理论和实际应用基础。

Graphene has attracted considerable attention as microwave absorption (MA) materials owing to its desirable properties such as low density and high dielectric loss. However, the poor impedance matching, resulting from the high complex permittivity, severely restricts the applications of graphene as a kind of MA materials. Lithium aluminosilicate glass ceramics (LAS) can improve the impedance matching characteristics of graphene significantly, since they have low complex permittivity. More importantly, electron conductance and ionic conductance coexist in the graphene/LAS composites due to the introduction of active lithium ions. Nevertheless, the synergetic microwave loss mechanism of electron conductance and ionic conductance was rarely reported. This project will study the influence of LAS microstructure and rGO/LAS interface on the dielectric properties of rGO/LAS composites, which are prepared by the sol-gel reaction, in order to clarify the effect of lithium ions, LAS microstructure, doping of graphene on MA properties of rGO/LAS composites. The synergetic microwave loss mechanism of electron conductance and ionic conductance will be investigated and clarified. The successful implement of this project will provide new idea in the field of impedance matching improvement and wave absorption mechanism, which will build the basis of theory and application of dielectric loss type MA rGO/LAS composites with light weight and high MA performance.