Over decades, the ever-increasing demand for compact, lightweight, low-cost and flexible energy storage devices has spurred the development of high performance dielectric-polymer-based capacitors from industry and academic. Despite previous effort, to date, the capacitive performance such as discharged energy density of dielectric polymers is still greatly limited, posing an obstacle to their wide applications. Herein, in this work, we demonstrated a facile while highly efficient approach to dramatically enhance the capacitive performance of dielectric polymers represented by poly(vinylidene fluoride) (PVDF) through the employment of manganese dioxide (MnO2) particles and their geometric structure modulation. (nhnhanh)