Ultrahigh–energy density lead-free dielectric films via polymorphic nanodomain design

By Haowei Pan, Fei Li, Yao Liu, Qinghua Zhang, Meng Wang, Shun Lan, Yunpeng Zheng, Jing Ma, L. Gu, Yang Shen and 5 more. Science, 2019

971 citations recorded by the source corpus.

Ultrahigh energy density dielectric film Dielectrics help hold charge as capacitors and are fundamental energy storage components. Improving energy density and other properties may help these materials be more competitive with batteries for energy storage applications. Pan et al. introduced a specific type of nanodomain structure in a BiFeO3-BaTiO3-SrTiO3 solid solution that dramatically increased the energy density. The nanodomains were organized so as to minimize energy loss during polarization switching. The enhancement in the dielectric properties suggests that the strategy may be useful for designing high-performance dielectrics. Science, this issue p. 578 A strategy for optimizing a ceramic solid solution enables the design of better high-performance capacitors. Dielectric capacitors with ultrahigh power densities are fundamental energy storage components in electrical and electronic systems. However, a long-standing challenge is improving their energy densities. We report dielectrics with ultrahigh energy densities designed with polymorphic nanodomains. Guided by phase-field simulations, we conceived and synthesized lead-free BiFeO3-BaTiO3-SrTiO3 solid-solution films to realize the coexistence of rhombohedral and tetragonal nanodomains embedded in a cubic matrix. We obtained minimized hysteresis while maintaining high polarization and achieved a high energy density of 112 joules per cubic centimeter with a high energy efficiency of ~80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscale domain structure manipulation.

Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/343a960d8ac81ad1243ae50292e77748cfdc44a0

Citations in the corpus