Enhanced Energy‐Storage Properties and Good Temperature Stability in 0.92(Sr0.7Bi0.2)TiO3–0.08Bi(Mg0.5Hf0.5)O3 Relaxor Ferroelectric Ceramic. Issue 6 (8th March 2021)

• Record Type: Journal Article
• Authors: Kong, Xi; Yang, Letao; Cheng, Zhenxiang; Zhang, Shujun
• Is Part Of: Advanced energy & sustainability research. Volume 2:Issue 6(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-08
• Subjects: ceramics -- energy density -- energy storage -- relaxor -- temperature stability; Renewable energy sources -- Periodicals; Environmental sciences -- Periodicals; Sustainable development -- Periodicals; 621.042
• DOI: 10.1002/aesr.202100015
• Languages: English
• ISSNs: 2699-9412

Abstract

Abstract : Herein, the (1 − x )(Sr0.7 Bi0.2 )TiO3 – x Bi(Mg0.5 Hf0.5 )O3 (SBT–100 x BMH, x = 0.04–0.10) relaxor ferroelectric ceramics are fabricated via the high‐temperature solid‐state reaction method. Dielectric and ferroelectric measurements reveal a typical relaxor characteristic with diffused and frequency‐dependent dielectric peaks. The characteristic Weibull breakdown strength (BDS) of 470 kV cm −1 with satisfied reliability is obtained by DC breakdown measurement. A maximum recoverable energy density of 3.5 J cm −3 with the corresponding energy efficiency of 92% is simultaneously achieved at 380 kV cm −1 . The recoverable energy density exhibits minor degradations from ambient temperature to 200 °C with variation below 20%, whereas the energy efficiency is maintained above 90%. In addition, the SBT–8BMH ceramic possesses a fast charge–discharge speed with high discharge power density of 2.9 MW cm −3 . All the results make this lead‐free relaxor ferroelectric ceramic a promising potential candidate for high‐temperature energy‐storage capacitor applications. Abstract : 0.92(Sr0.7 Bi0.2 )TiO3 –0.08 Bi(Mg0.5 Hf0.5 )O3 relaxor ceramic exhibits a high recoverable energy‐storage density of 3.5 J cm −3 and high energy efficiency of 92% at 380 kV cm −1 . Of particular importance is that it maintains the high energy efficiency (>90%) up to 200 °C, which makes it suitable for energy‐storage capacitors working under a high‐temperature environment.