All-Organic Composite Materials for Dielectric Capacitors Based on PMMA/PVDF Films: Theory, Copolymer Modification, Structural Designs and Future Prospects

Polymer-based film capacitors are extensively utilized in various industries, including new energy vehicles, high-voltage transmission, and microwave communication, owing to their fast charge-discharge rate, low energy loss, and high power density. In recent years, polymer-based inorganic nanocomposite dielectric films have been extensively researched, revealing challenges in processing and application because of poor compatibility. On the contrary, all-organic polymer dielectrics have been focused on in the field of energy storage because they are more suitable for large-scale production because of their low cost and excellent processability, showcasing promising prospects for development. This review introduces the theory of dielectric energy storage, such as polarization mechanism, breakdown mechanism, conduction mechanism, and energy storage parameters, in detail and depth, and emphasizes the research progress of PMMA-based and PVDF-based copolymers, and PMMA-based/PVDF-based all-organic composite materials, including molecular structure design, blend modification, and structural design. Eventually, some possible problems and future research priorities are presented for all-organic PMMA-based/PVDF-based dielectric composite materials.