Phase and Band Structure Engineering via Linear Additive in NBT-ST for Excellent Energy Storage Performance with Superior Thermal Stability

Wenjun Cao; Renju Lin; Pengfei Chen; Feng Li; Binghui Ge; Dongsheng Song; Jian Zhang; Zhenxiang Cheng; Chunchang Wang

doi:10.1021/acsami.2c17170

Phase and Band Structure Engineering via Linear Additive in NBT-ST for Excellent Energy Storage Performance with Superior Thermal Stability

ACS Appl Mater Interfaces. 2022 Dec 7;14(48):54051-54062. doi: 10.1021/acsami.2c17170. Epub 2022 Nov 22.

Authors

Wenjun Cao¹, Renju Lin², Pengfei Chen¹, Feng Li², Binghui Ge², Dongsheng Song², Jian Zhang³, Zhenxiang Cheng⁴, Chunchang Wang¹

Affiliations

¹ Laboratory of Dielectric Functional Materials, School of Materials Science & Engineering, Anhui University, Hefei230601, China.
² Institute of Physical Science and Information Technology, Anhui University, Hefei230601, China.
³ College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou325035, China.
⁴ Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, New South Wales2500, Australia.

PMID: 36413744
DOI: 10.1021/acsami.2c17170

Abstract

Lead-free relaxor ferroelectric ceramics with ultrahigh energy-storage performance are vital for pulsed power systems. We herein propose a strategy of phase and band structure engineering for high-performance energy storage. To demonstrate the effectiveness of this strategy, (1 - x)(0.75Na_0.5Bi_0.5TiO₃-0.25SrTiO₃)-xCaTi_0.875Nb_0.1O₃ (NBT-ST-xCTN, x = 0.1, 0.2, 0.3, 0.4, and 0.5) samples were designed and fabricated via the solid-state reaction method. The linear dielectric CTN was used as a modulator to tune both phase and band structures of the tested system. Our results show that both rhombohedral phase (R-phase) and tetragonal phase (T-phase) coexist in the samples. The R/T ratio decreases, while the band gap increases with increasing CTN content. The best energy-storage properties with large energy storage density (W_rec = 7.13 J/cm³), a high efficiency (η = 90.3%), and an ultrafast discharge time (25 ns) were achieved in the NBT-ST-0.4CTN sample with R/T = 0.121. Importantly, along with its excellent energy-storage performance, the sample exhibited superior thermal stability with the variations of W_rec ≤ 7% and η ≤ 10% over the wide temperature range of 233-413 K. This work suggests that this engineering of phase and band structures is a promising strategy to achieve superior energy-storage properties in lead-free ceramics.

Keywords: Energy storage; Excellent efficiency; Na0.5Bi0.5TiO3; Phase and band structure engineering; Superior thermal stability.