Issue 20, 2024

PEI-based all-organic composite films with simultaneous excellent energy storage density and high efficiency

Abstract

All-organic composite films have attracted the attention of researchers due to their excellent properties such as high breakdown strength, flexibility, and self-healing ability. However, they are facing a major challenge of not being able to simultaneously increase the energy storage density (Ue) and efficiency (η). Linear dielectric polyetherimide (PEI) with high η is currently the focus of research in the field of energy storage. Nevertheless, its low dielectric constant (εr) often does not result in satisfactory Ue. In this paper, PEI is selected as the matrix, and all-organic bilayer composite dielectric films with pure PEI as the bottom layer and a PVDF/PEI blended layer as the top layer are designed and prepared by the solution casting method. The results demonstrate that the high dielectric constant of PVDF and the microscopic interfacial polarization within the blended layer enhance the polarization strength of the bilayer composite film, while the low dielectric loss of PEI ensures the high η of the bilayer composite film, which significantly improves the Ue of the bilayer composite film. Ultimately, the bilayer composite film achieves an excellent Ue of up to 20.16 J cm−3 and a high η of 94.6% under an electric field of 640 MV m−1 with a PVDF blend of 50 vol% components. The simulation of the electric breakdown process by finite element analysis provides support for the breakdown mechanism of the bilayer composite films. The Ue of the designed bilayer all-organic composite films exceeds that of the most advanced all-organic dielectric films reported to date, with η greater than 92%. Consequently, this paper provides a novel strategy for the design of all-organic dielectrics with high Ue and high η.

Graphical abstract: PEI-based all-organic composite films with simultaneous excellent energy storage density and high efficiency

Supplementary files

Article information

Article type
Paper
Submitted
04 Mar 2024
Accepted
02 Apr 2024
First published
12 Apr 2024

J. Mater. Chem. A, 2024,12, 12112-12118

PEI-based all-organic composite films with simultaneous excellent energy storage density and high efficiency

Y. Ma, Y. Lin, Y. Zhang, Z. Dang, Y. Wang, Q. Yuan and H. Yang, J. Mater. Chem. A, 2024, 12, 12112 DOI: 10.1039/D4TA01478B

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