Demonstration of ultra-high recyclable energy densities in domain-engineered ferroelectric films

Hongbo Cheng, Jun Ouyang (), Yun-Xiang Zhang, David Ascienzo, Yao Li, Yu-Yao Zhao and Yuhang Ren ()
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Hongbo Cheng: Shandong University
Jun Ouyang: Shandong University
Yun-Xiang Zhang: Shandong University
David Ascienzo: Hunter College of the City University of New York
Yao Li: Shandong University
Yu-Yao Zhao: Shandong University
Yuhang Ren: Hunter College of the City University of New York

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Dielectric capacitors have the highest charge/discharge speed among all electrical energy devices, but lag behind in energy density. Here we report dielectric ultracapacitors based on ferroelectric films of Ba(Zr0.2,Ti0.8)O3 which display high-energy densities (up to 166 J cm–3) and efficiencies (up to 96%). Different from a typical ferroelectric whose electric polarization is easily saturated, these Ba(Zr0.2,Ti0.8)O3 films display a much delayed saturation of the electric polarization, which increases continuously from nearly zero at remnant in a multipolar state, to a large value under the maximum electric field, leading to drastically improved recyclable energy densities. This is achieved by the creation of an adaptive nano-domain structure in these perovskite films via phase engineering and strain tuning. The lead-free Ba(Zr0.2,Ti0.8)O3 films also show excellent dielectric and energy storage performance over a broad frequency and temperature range. These findings may enable broader applications of dielectric capacitors in energy storage, conditioning, and conversion.

Date: 2017
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DOI: 10.1038/s41467-017-02040-y

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