Enhancing the energy density and discharge efficiency of dielectric poly(vinylidene fluoride) (PVDF) has long been a challenging task to realize their practical application as advanced electrostatic capacitors. Herein, in this work, we demonstrated a facile yet effective approach to simultaneously strengthen the energy density and discharge efficiency of PVDF through the synergy of optimized fabrication process and introduction of aligned MnO₂ hollow spheres. First, using a nonequilibrium manufacturing approach involving electrospinning, hot-pressing and hot-rolling, reduced ferroelectric loss and improved breakdown strength was achieved in PVDF, which were advantageous to enhance the energy density and discharge efficiency. By further introducing oriented MnO₂ microspheres, one could boost the discharge energy density up to 36J/cm³ while maintain the high discharge efficiency of 73% (500MV/m) due to the enhanced interfacial coupling effect and suppressed conduction loss. This work provides a new paradigm to explore high performance PVDF based composites as viable dielectrics for electrostatic capacitors.

长期以来，提高电介质聚偏二氟乙烯（PVDF）的能量密度和放电效率对于实现其作为高级静电电容器的实际应用一直是一项艰巨的任务。在本文中，我们展示了一种简便而有效的方法，可通过优化制造工艺和引入定向MnO ₂空心球的协同作用来同时增强PVDF的能量密度和放电效率。首先，使用涉及电纺丝，热压和热轧的非平衡制造方法，PVDF的铁电损耗降低，击穿强度提高，有利于提高能量密度和放电效率。通过进一步引入取向的MnO ₂由于增强的界面耦合效应和抑制的传导损耗，一种微球可以将放电能量密度提高到36J / cm ^3，同时保持73％（500MV / m）的高放电效率。这项工作为探索基于高性能PVDF的复合材料作为静电电容器的可行电介质提供了新的范例。