Lead-Free Relaxor Ferroelectric Ceramics with Ultrahigh Energy Storage Densities via Polymorphic Polar Nanoregions Design

Da Li; Di Zhou; Dong Wang; Weichen Zhao; Yan Guo; Zhongqi Shi; Tao Zhou; Shi-Kuan Sun; Charanjeet Singh; Sergei Trukhanov; Antonio Sergio Bezerra Sombra

doi:10.1002/smll.202206958

Lead-Free Relaxor Ferroelectric Ceramics with Ultrahigh Energy Storage Densities via Polymorphic Polar Nanoregions Design

Small. 2023 Feb;19(8):e2206958. doi: 10.1002/smll.202206958. Epub 2022 Dec 11.

Authors

Da Li¹, Di Zhou¹, Dong Wang², Weichen Zhao¹, Yan Guo¹, Zhongqi Shi³, Tao Zhou⁴, Shi-Kuan Sun⁵, Charanjeet Singh⁶, Sergei Trukhanov⁷, Antonio Sergio Bezerra Sombra⁸

Affiliations

¹ Electronic Materials Research Laboratory & Multifunctional Materials and Structures, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
² Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behaviour of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
³ State Key Laboratory for Mechanical Behaviour of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
⁴ School of Electronic and Information Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China.
⁵ School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong, 528000, China.
⁶ School of Electronics and Communication Engineering, Lovely Professional University, Jalandhar, Punjab, 144411, India.
⁷ National University of Science and Technology MISiS, Moscow, 119049, Russian Federation.
⁸ Laboratory of Telecommunications and Materials Science and Engineering (LOCEM), Physics Department, Federal University of Ceará (UFC), Fortaleza, CE, 60455-760, Brazil.

PMID: 36507596
DOI: 10.1002/smll.202206958

Abstract

One of the long-standing challenges of current lead-free energy storage ceramics for capacitors is how to improve their comprehensive energy storage properties effectively, that is, to achieve a synergistic improvement in the breakdown strength (E_b ) and the difference between maximum polarization (P_max ) and remnant polarization (P_r ), making them comparable to those of lead-based capacitor materials. Here, a polymorphic polar nanoregions (PNRs) structural design by first introducing 0.06 mol BaTiO₃ into Bi_0.5 Na_0.5 TiO₃ is proposed to construct the morphotropic phase boundary with coexisting structures of micrometer-size domains and polymorphic nanodomains, enhance the electric field-induced polarization response (increase P_max ). Then Sr(Al_0.5 Ta_0.5 )O₃ (SAT)-doped 0.94 Bi_0.5 Na_0.5 TiO₃ -0.06BaTiO₃ (BNBT) energy storage ceramics with polymorphic PNRs structures are synthesized following the guidance of phase-field simulation and rational composition design (decrease P_r ). Finally, a large recoverable energy density (W_rec ) of 8.33 J cm^-3 and a high energy efficiency (η) of 90.8% under 555 kV cm^-1 are obtained in the 0.85BNBT-0.15SAT ceramic prepared by repeated rolling process method (enhance E_b ), superior to most practical lead-free competitors increased consideration of the stability of temperature (a variation <±6.2%) and frequency (W_rec > 5.0 cm^-3 , η > 90%) at 400 kV cm^-1 . This strategy provides a new conception for the design of other-based multifunctional energy storage dielectrics.

Keywords: Bi 0.5Na 0.5TiO 3; energy storage; morphotropic phase boundary; phase-field simulations; polymorphic polar nanoregions (PNRs).

Abstract

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