Achieving ultrahigh energy storage performance in bismuth magnesium titanate film capacitors: Via amorphous-structure engineering

Authors

Juan Xie, Wuhan University of Technology
Hanxing Liu, Wuhan University of Technology
Zhonghua Yao, Wuhan University of Technology
Hua Hao, Wuhan University of Technology
Yanjiang Xie, Wuhan University of Technology
Zongxin Li, Wuhan University of Technology
Minghe Cao, Wuhan University of Technology
Shujun Zhang, University of WollongongFollow

RIS ID

140073

Publication Details

Xie, J., Liu, H., Yao, Z., Hao, H., Xie, Y., Li, Z., Cao, M. & Zhang, S. (2019). Achieving ultrahigh energy storage performance in bismuth magnesium titanate film capacitors: Via amorphous-structure engineering. Journal of Materials Chemistry C, 7 (43), 13632-13639.

Abstract

Pure perovskite Bi(Mg0.5Tix)O3 (abbreviated as BMTx) thin films are successfully fabricated on Pt/Ti/SiO2/Si substrates by a sol-gel method, where the excess TiO2 with an amorphous structure is designed to improve the energy storage performance. The dielectric breakdown strength is found to be abruptly improved for the sample with x ≥ 0.65 due to the synergistic contributions from the fine grain size and amorphous phase structure, which greatly decreases the leakage current. Of particular significance is that BMTx with x = 0.75 exhibits a super high recoverable energy storage density of 126 J cm-3 at 5000 kV cm-1, demonstrating the great potential of environmentally friendly BMTx thin films for energy storage capacitor applications.