Research on the energy storage performance of laminated composites based on multidimensional co-design in a broad temperature range

Abstract

Polymer dielectrics play an irreplaceable role in electronic power systems because of their high power density and fast charge–discharge capability, but it is limited by their low stability in the temperature range of 25–200 °C. Rather than the introduction of one-dimensional fillers in polymers, we used a kind of multidimensional synergistic design to prepare Al₂O₃–TiO₂–Al₂O₃/PI composites with layered structures by introducing multi-dimensional materials in polyimide (PI). In fact, the composite achieves much higher temperature stability than the pure PI film. The optimally proportioned composite has an energy density of 3.41 J cm⁻³ (vs. 1.48 J cm⁻³ for pure PI) even at 200 °C. Additionally, it reaches an impressive energy density retention of up to 90% and maintains an energy efficiency as high as 86% at 400 MV m⁻¹ in the temperature range of 25–200 °C. The multidimensional coordination design is proposed to obtain composite films, and provides a feasible strategy in the study of polymer-based composites with high-temperature performance.