Enhancing the energy storage performance of all-organic dielectrics based on VDF-based polymers: chemical and physical strategies

In the context of accelerated energy depletion, the efficient storage and release of energy has emerged as a pivotal concern. Dielectric capacitors have garnered significant attention for their high power density, rapid charging and discharging rates, and extended cycle life. With the development of electronic power equipment in the direction of lightweight and flexibility, all-organic dielectrics show a broad development prospect in the field of energy storage dielectric capacitors by virtue of their light weight, easy processing, high breakdown strength and other advantages. Among them, vinylidene fluoride (VDF)-based polymers exhibit high polarization characteristics, which are conducive to achieving high energy storage density ( U d ). However, severe polarization hysteresis leads to low charge/discharge efficiency. In response to these properties, this review explores various chemical and physical strategies to enhance the energy storage performance of VDF-based polymers based on three perspectives: modulation of polarization behavior, reduction of dielectric loss and enhancement of breakdown strength. The chemical strategy is centered on the design of the molecular chain structure, and the highest U d of 23.3 J/cm 3 was obtained by grafting linear polymers. The physical strategy focuses on modulating the structure of the aggregation state, and the special processing method of “Press & Folding” enables PVDF to achieve the highest U d of 39.8 J/cm 3 . Finally, suggestions are made for future research and development, as well as for the challenges that VDF-based all-organic dielectrics will have to overcome. • Energy storage performance can be optimized from three perspectives. • Chemical and physical strategies to enhance energy storage performance are reviewed. • Insights for future research on VDF-based all-organic dielectrics.