Achieving high energy storage performance in all-organic polymers through regulation of multi-layer interface structures

Abstract Using experimental design, a novel polymer multilayer dielectric film was successfully fabricated, exhibiting outstanding energy-storage performance. The high-quality ultrathin acrylate layer formed via an in-situ curing process effectively filled the pores and defects on the surface of the BOPP film, significantly enhancing the interfacial integrity and suppressing charge injection from the electrodes during testing, thereby improving the energy storage properties of the composite film. Finally, within the experimentally accessible electric field range, the multilayer film achieved a high energy storage density of 5.1 J·cm −3 and a charge–discharge efficiency exceeding 95%, far surpassing that of pristine BOPP film (~2.9 J·cm −3 ).