Polymer nanocomposites with high energy storage densities

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Introduction Capacitors with high power and high energy have been actively pursued in recent decades because of their critical role in modern electronic and electrical applications, such as highfrequency inverters, insulated-gate bipolar transistor snubbers, power factor correction, and pulsed power generation.1,2 Electrostatic capacitors offer the highest power density, lowest loss, and highest operating voltage among various types of capacitors, including electrolytic capacitors and supercapacitors. However, the low energy densities of these capacitors (700 V m–1), low dielectric losses (