Enhancing energy storage property of polypropylene‐based sandwich composites with surface‐modified nonzero dimensional nanomaterials

Author:

Bai Yating1,Zhao Hang1ORCID,Yin Lei1,Bai Jinbo2

Affiliation:

1. International Collaborative Center on Photoelectric Technology and Nano Functional Materials, and Institute of Photonics & Photon‐Technology Northwest University Xi'an China

2. Laboratoire de Mécanique des Sols, Structures et Matériaux, CNRS UMR 8579, Centrale‐Supélec Université Paris‐Saclay Gif‐sur‐Yvette France

Abstract

AbstractPolypropylene (PP) is a classical organic material for dielectric capacitor, exhibiting typical linear charge–discharge characteristics. However, its low energy density fails to meet the operating requirements of high‐power and energy storage systems. In this study, techniques such as spray‐coating, lamination hot‐pressing, melt blending, and in situ melt‐drawing are employed to fabricate PP‐based sandwich‐structured composite dielectrics. The outer layers consist of BN nanosheets (BNNSs)/PP composite, while the middle layer comprises Ba0.7Sr0.3TiO3@Polydopamine (BST@PDA)/PP. The introduction of BNNSs with a wide bandgap improves the breakdown strength of composites. BST@PDA increases the overall polarization of the composites and alleviates the local electric field concentration caused by hetero‐interfacial field distortion. When the filling concentration of BNNSs is 0.10 wt% and that of BST@PDA nanowires is 3 wt%, the composite demonstrates a high dielectric constant and low dielectric loss. Additionally, the sandwich‐structured composite, exhibiting a high charge–discharge efficiency of 97.80%, presents enhanced breakdown strength (Eb ~ 453 MV/m) and increased energy storage density (Ue ~ 5.67 J/cm3), which are 39.38% and 189.29% higher than neat PP (325 MV/m, 1.96 J/cm3), respectively. This study offers a viable and efficient approach to augment the energy storage density of PP‐based dielectrics.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shaanxi Province

Publisher

Wiley

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