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Superior Capacitive Energy-Storage Performance in Pb-Free Relaxors with a Simple Chemical Composition

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.2c12200· OSTI ID:1965228
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [1];  [1];  [4];  [5];  [5];  [1];  [1]
  1. University of Science and Technology, Beijing (China)
  2. Nanjing University of Science and Technology (China)
  3. Guilin University of Technology (China)
  4. Argonne National Laboratory (ANL), Lemont, IL (United States)
  5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Chemical design of lead-free relaxors with simultaneously high energy density (Wrec) and high efficiency (η) for capacitive energy-storage has been a big challenge for advanced electronic systems. The current situation indicates that realizing such superior energy-storage properties requires highly complex chemical components. Herein, we demonstrate that, via local structure design, an ultrahigh Wrec of 10.1 J/cm3, concurrent with a high η of 90%, as well as excellent thermal and frequency stabilities can be achieved in a relaxor with a very simple chemical composition. By introducing 6s2 lone pair stereochemical active Bi into the classical BaTiO3 ferroelectric to generate a mismatch between A- and B-site polar displacements, a relaxor state with strong local polar fluctuations can be formed. Through advanced atomic-resolution displacement mapping and 3D reconstructing the nanoscale structure from neutron/X-ray total scattering, it is revealed that the localized Bi enhances the polar length largely at several perovskite unit cells and disrupts the long-range coherent Ti polar displacements, resulting in a slush-like structure with extremely small size polar clusters and strong local polar fluctuations. This favorable relaxor state exhibits substantially enhanced polarization, and minimized hysteresis at a high breakdown strength. This work offers a feasible avenue to chemically design new relaxors with a simple composition for high-performance capacitive energy-storage.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Argonne National Laboratory (ANL), Lemont, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Central Universities, China; China Postdoctoral Science Foundation; Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
1965228
Alternate ID(s):
OSTI ID: 2404499
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 11 Vol. 145; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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