High‐energy storage performance in BaTiO3‐based lead‐free multilayer ceramic capacitors

Yang, Huijing; Bao, Weichao; Lu, Zhilun; Li, Linhao; Ji, Hongfen; Huang, Yuhe; Xu, Fangfang; Wang, Ge; Wang, Dawei

Abstract

Lead-free BaTiO3 (BT)-based multilayer ceramic capacitors (MLCCs) with the thickness of dielectric layers ~9 μm were successfully fabricated by tape-casting and screen-printing techniques. A single phase of the pseudo-cubic structure was revealed by X-ray diffraction. Backscattered images and energy-dispersive X-ray elemental mapping indicated the high quality of MLCCs without observation of interaction, wrapping, or delamination. The relaxor state was confirmed by transmission electron microscopy and temperature-dependent permittivity. Impedance spectroscopy at various temperatures revealed the electrical heterogeneous response for MLCCs with high-resistive electrical components. Improved energy storage performance was obtained by multilayering, comparing with the bulk ceramics. Enhanced recoverable energy density ~6.88 J/cm3 with high efficiency ~90% were realized under an electric field of 820 kV/cm, which is mainly attributed to the intrinsic high-resistivity and relaxor behavior. Furthermore, good temperature (20–85 °C) and frequency stabilities (0.5–50 Hz) were observed in the MLCCs, which are attractive for pulsed power applications.

• Journal Article Type: Article
• Acceptance Date: Sep 16, 2020
• Online Publication Date: Feb 17, 2021
• Publication Date: Mar 28, 2021
• Deposit Date: Oct 23, 2021
• Journal: Journal of Materials Research
• Print ISSN: 0884-2914
• Electronic ISSN: 2044-5326
• Publisher: Cambridge University Press
• Peer Reviewed: Peer Reviewed
• Volume: 36
• Issue: 6
• Pages: 1285-1294
• DOI: https://doi.org/10.1557/s43578-020-00093-2
• Keywords: multilayer ceramic capacitors, BaTiO3, pulsed power, relaxor
• Public URL: http://researchrepository.napier.ac.uk/Output/2816066