在新一代薄膜脉冲技术中，制备高介电常数、高击穿场强以及低损耗的聚合物基电介质材料是实现高能量密度储能的关键。然而，如何有效降低高场强下聚合物复合膜的损耗是当前研究的难点。本项目针对高场强时的能量损耗问题，采用氧化石墨烯包覆钛酸钡（BaTiO3@GO）核-壳结构纳米颗粒，与聚（偏氟乙烯-三氟乙烯-氯氟乙烯）（P(VDF-TrFE-CFE)）制备介电复合膜，通过GO热还原程度实现介电复合膜界面的调控，研究制备方法和工艺参数对复合膜晶体结构、结晶相组成和界面的影响，探讨其对介电性能、极化行为、电学性能和储能性能的影响规律，分析高场强下复合膜的损耗表现形式，建立高场强下复合膜的损耗机制，为PVDF基电介质复合材料的开发提供数据支撑和理论指导。

In pulsed power storage technology, high dielectric constant, high breakdown and low loss are key parameters for the next-generation flexible capacitor with high energy density. Polymer-based nanocomposite is a promising candidate material for the new pulse power capacitor. However, it is difficult in current researches to reduce the loss and enhance the energy efficient of PVDF-based dielectric nanocomposite. In order to explore the interfacial characterization and loss issues during charge-discharge cycle, a polar-fluoropolymer nanocomposite film consisting of low-loss poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) and crumpled nanosheets high-k nanoparticles is developed. The phase, crystal structure and interphase of nanocomposite film are tuned by the fabrication and post process. The influence of nanostructure on the dielectric property, polarization, energy storage performance and charge-discharge cycle loss of nanocomposite film is investigated. The mechanism of energy loss in PVDF-based nanocomposite film under high electrical field is developed. The correlation between interface and energy storage ability during device operation is to be explored, which should lay the theoretical ground work for the dielectric properties enhancement, featuring great intellectual merits and broad engineering implications of PVDF-based dielectrics.