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Research Article | Open Access

Nanonet-/fiber-structured flexible ceramic membrane enabling dielectric energy storage

Lvye DOU, Bingbing YANG, Shun LAN, Yiqian LIU, Yuan-Hua LIN( ), Ce-Wen NAN
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

Ceramics are considered intrinsically brittle at macro scale due to the lack of slip mechanism and pre-existing defects, which greatly limits their potential applications in emerging fields including wearable electronic devices and flexible display. In this contribution, we developed BiFeO3/SiO2 dual-networks with exceptional flexibility through a coupled electronetting/electrospun method. The hybrid nanostructured networks endow the material with high tensile strength (2.7 MPa), excellent flexibility (80% recoverable deformation), and robust fatigue resistance performance (maintain flexibility after a 1000-cyclic compress test). After in-situ compounded with dielectric polymer via a layer-by-layer solution casting method, the resultant three-dimensional (3D) composite film exhibits a twice higher dielectric constant (εr) than polyether imide (PEI) film. More importantly, the breakdown strength of the 3D composite film is almost the same as that of the PEI film, resulting in an enhanced energy density of ~6.0 J/cm3 and a high efficiency of 80% at 4.58 MV/cm. The unique structure, combined with the excellent balance between mechanical and dielectric properties in flexible structures, is of critical significance to the design of flexible functional ceramics and broadening their applications in wearable electric devices.

Keywords

BiFeO3/SiO2 dual-networkflexiblemechanically robustdielectric energy storage

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Journal of Advanced Ceramics
Volume 12 Issue 1,
January 2023
Pages 145-154
DOI: 10.26599/JAC.2023.9220673
Cite this article:
DOU L, YANG B, LAN S, et al. Nanonet-/fiber-structured flexible ceramic membrane enabling dielectric energy storage. Journal of Advanced Ceramics, 2023, 12(1): 145-154. https://doi.org/10.26599/JAC.2023.9220673

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Received: 07 September 2022
Revised: 28 September 2022
Accepted: 06 October 2022
Published: 09 December 2022
© The Author(s) 2022.

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