Large dielectric loss and low energy storage efficiency are common problems of poly(vinylidene fluoride) (PVDF) and its copolymers based energy storage dielectrics which has limited their applications. To solve these problems, linear dielectric polymethyl methacrylate (PMMA) with low intrinsic dielectric loss was chosen as the interlayers of P(VDF-TrFE-CFE) (PVTC) to form the multilayer structure dielectric. A small amount of silicon dioxide-coated Ba_0.6Sr_0.4TiO₃ fibers (BST@SiO₂) were incorporated into the PVTC layer to compensate the polarization decreasing due to the introduction of PMMA. The results showed that the optimized multilayer structure can significantly improve the energy storage efficiency and has a positive impact on enhancing both breakdown strength and permittivity. An enhanced and acceptable efficiency (85%) with a high energy density (10 J/cm³) were achieved in the 0.5 vol% 9-layer aligned BST@SiO₂ PVTC/PMMA dielectric. This work can sever as a route to simultaneously obtain high energy storage density and efficiency in polymer based composites.

大的介电损耗和低的能量存储效率是聚偏二氟乙烯（PVDF）及其基于共聚物的能量存储电介质的普遍问题，这限制了它们的应用。为了解决这些问题，选择具有低固有电介质损耗的线性电介质聚甲基丙烯酸甲酯（PMMA）作为P（VDF-TrFE-CFE）（PVTC）的中间层，以形成多层结构电介质。少量涂有二氧化硅的Ba _0.6 Sr _0.4 TiO ₃纤维（BST @ SiO ₂）被掺入PVTC层中以补偿由于引入PMMA而引起的极化降低。结果表明，优化的多层结构可以显着提高储能效率，并且对提高击穿强度和介电常数均具有积极的影响。在0.5体积％的9层取向BST @ SiO ₂ PVTC / PMMA电介质中，获得了具有较高能量密度（10 J / cm ³）的增强且可接受的效率（85％）。这项工作可以作为在聚合物基复合材料中同时获得高能量存储密度和效率的途径。