Film capacitors are important in high-tech fields such as power transmission and transformation systems

electric vehicles

and pulse power systems. Currently

the performance of capacitors is limited by the biaxially oriented polypropylene film

which leads to low energy storage density

poor temperature resistance

few charge and discharge cycles

and short lifespan of capacitors. This seriously affects the further improvement of the performance of metallized film capacitors and cannot meet the demands of high-energy-density metallized film capacitors in many fields. However

the key issues

including limited improvement in the comprehensive performance of dielectric materials for high-energy-density capacitors

and the difficulty in the industrial production of high-energy-density dielectric polymer materials from the small-sized samples produced in a laboratory

make it difficult to verify the comprehensive performance of metalized film capacitors. Therefore

several important perspectives and advice

including materials composite technology

materials chemical modification

and coating layers modification as well as the energy storage performance enhancement of dielectric films and high-energy-density capacitors design

are proposed in this article to guide the future research direction and promote the development of advanced dielectric materials for high-energy-density film capacitor application in China.