Polymer-based dielectric materials for high-temperature film capacitors

High-temperature dielectrics capacitors are highly needed in the electrical and electronic industries, underground oil explorations and many other areas. However, the apparent conductions loss under high temperatures and the related thermal runaway are the main problems with the high-temperature polymer dielectric. In this report, we summarized and presented three recently developed approaches to improve the energy-storage properties by suppressing the conduction loss under high temperatures. The three approaches include single-layer nanocomposites with highly insulated inorganic nanosheets, sandwich-structured composites and inorganic-coated polymers. All the three approaches can effectively decrease the leakage current and improve the discharged energy density.