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Open AccessArticle

K0.5Na0.5NbO3-SrTiO3/PVDF Polymer Composite Film with Low Remnant Polarization and High Discharge Energy Storage Density

1
School of Science, Harbin University of Science and Technology, Harbin 150080, China
2
Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
3
State Grid Fuzhou Electric Power Supply Company, Fuzhou 350009, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(2), 310; https://doi.org/10.3390/polym11020310
Received: 16 January 2019 / Revised: 2 February 2019 / Accepted: 3 February 2019 / Published: 12 February 2019
A high recoverable energy storage density polymer composite film has been designed in which the ferroelectric-paraelectric 0.85 (K0.5Na0.5NbO3)-0.15SrTiO3 (abbreviated as KNN-ST) solid solution particles were introduced into polyvinylidene fluoride (PVDF) polymer as functional fillers. The effects of the polarization properties of K0.5Na0.5NbO3 (KNN) and KNN-ST particles on the energy storage performances of KNN-ST/PVDF film were systemically studied. And the introduction of SrTiO3 (ST) was effective in reducing the remnant polarization of the particles, improving the dielectric properties and recoverable energy storage density of the KNN-ST/PVDF films. Compared to KNN/PVDF films, the dielectric permittivity of composite films was enhanced from 17 to 38 upon the introduction of ST. A recoverable energy storage density of 1.34 J/cm3 was achieved, which is 202.60% larger than that of the KNN/PVDF composite films. The interface between the particles and the polymer matrix was considered to the enhanced dielectric permittivity of the films. And the reduced remnant polarization of the composites was regarded as the improving high recoverable energy storage density. The results demonstrated that combing ferroelectric- paraelectric particles with polymers might be a key method for composites with excellent dielectric permittivity, high energy storage density, and energy efficiency. View Full-Text
Keywords: recoverable energy density; remnant polarization; SrTiO3; PVDF; polymer composites recoverable energy density; remnant polarization; SrTiO3; PVDF; polymer composites
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MDPI and ACS Style

Chen, C.; Wang, L.; Liu, X.; Yang, W.; Lin, J.; Chen, G.; Yang, X. K0.5Na0.5NbO3-SrTiO3/PVDF Polymer Composite Film with Low Remnant Polarization and High Discharge Energy Storage Density. Polymers 2019, 11, 310. https://doi.org/10.3390/polym11020310

AMA Style

Chen C, Wang L, Liu X, Yang W, Lin J, Chen G, Yang X. K0.5Na0.5NbO3-SrTiO3/PVDF Polymer Composite Film with Low Remnant Polarization and High Discharge Energy Storage Density. Polymers. 2019; 11(2):310. https://doi.org/10.3390/polym11020310

Chicago/Turabian Style

Chen, Chuntian; Wang, Lei; Liu, Xinmei; Yang, Wenlong; Lin, Jiaqi; Chen, Gaoru; Yang, Xinrui. 2019. "K0.5Na0.5NbO3-SrTiO3/PVDF Polymer Composite Film with Low Remnant Polarization and High Discharge Energy Storage Density" Polymers 11, no. 2: 310. https://doi.org/10.3390/polym11020310

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