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

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(Zr_0.2,Ti_0.8)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(Zr_0.2,Ti_0.8)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

SUBMITTER: Cheng H 

PROVIDER: S-EPMC5722920 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature