Enhanced energy storage efficiency in PVDF based composite films using MnO 2 nano-fillers
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Enhanced energy storage efficiency in PVDF based composite films using MnO2 nano-fillers Yang Yu1, Xuan Wang1,*, Xiaoming Wang2, Xue Li2, Ling Weng1,2, and Xiaorui Zhang1,2,*
1
Key Laboratory of Engineering Dielectrics and Its Application, Harbin University of Science and Technology, Harbin 150080, People’s Republic of China 2 School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, People’s Republic of China
Received: 19 June 2020
ABSTRACT
Accepted: 24 August 2020
The flexible energy storage film based on PVDF matrix has very extensive application. The electrical properties of PVDF composite films doped by nanometer MnO2 was studied in this research, and the influences of MnO2 content on dielectric constant, breakdown strength and energy storage properties were systematic investigated. The results indicated that using MnO2 as fillers is an effective approach to improve the dielectric constant and breakdown strength of PVDF matrix composites. The dielectric constant is 18.1 and the breakdown electric field is 100 kV/mm when the content of MnO2 is 10 wt%. In addition, both large energy storage density (1.67 J/cm3) and high energy storage efficiency (81.9%) are obtained in composite film with 10 wt% MnO2. The enhancement of dielectric constant and energy storage efficiency are due to the ionic polarization of MnO2 under applied electric field. Moreover, the effect of MnO2 on electron trapping improves the breakdown strength and energy storage density of MnO2/PVDF composite films. This work provides a feasible route for designing flexible composites with excellent energy storage performance.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction High energy storage density materials have an important impact on the development of electronic power systems, especially in applications required charging and discharging rapidly [1–3]. As energy storage in electronic power systems has the characteristic of highly dispersity, instability and
intermittent [4, 5], it is very important to develop energy storage materials possessing excellent and stable performance simultaneously. Oxides ceramics are widely used as energy storage materials due to high dielectric constant and stable performance, but the application are limited by the expensive raw materials and complex technique process. Although polymer dielectric materials with good flexibility
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https://doi.org/10.1007/s10854-020-04335-1
J Mater Sci: Mater Electron
have lower manufacture temperature and lower cost than that of oxides ceramics, low energy storage density caused by low permittivity still limits their applications. Therefore, the main issue for the development of flexible energy storage materials is the improvement of the dielectric constant and breakdown electric field. Many studies were carried out on polymer matrix composites and numerous results have been obtained. Dang et al. [6] used th
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