期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-017-02040-y
关键词
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资金
- NSFC [51772175, 91122024]
- AFOSR [FA9550-17-1-0342, FA9550-17-1-0339]
- Program for New Century Excellent Talents in University (Ministry of Education)
- Nanotechnology Projects of Soochow City [ZXG201445]
- Fundamental Research Funds of Shandong University [2017ZD008, 2015YQ009, 2015JC034]
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(Zr-0.2, Ti-0.8)O-3 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(Zr-0.2, Ti-0.8)O-3 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(Zr-0.2, Ti-0.8)O-3 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.
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