Fatigue resistant lead-free multilayer ceramic capacitors with ultrahigh energy density

Wang, Ge; Lu, Zhilun; Yang, Huijing; Ji, Hongfen; Mostaed, Ali; Li, Linhao; Wei, Yiqi; Feteira, Antonio; Sun, Shikuan; Sinclair, Derek C.; Wang, Dawei; Reaney, Ian M.

Abstract

The critical role of electrical homogeneity in optimising electric-field breakdown strength (BDS) and energy storage in high energy density (0.7 − x)BiFeO3–0.3BaTiO3–xBi(Li0.5Nb0.5)O3 (BF–BT–xBLN) lead-free capacitors is demonstrated. The high BDS for bulk ceramics and multilayers (dielectric layer thickness ∼ 8 μm) of ∼260 and ∼950 kV cm−1, respectively, gives rise to record-performance of recoverable energy density, Wrec = 13.8 J cm−3 and efficiency, η = 81%. Under an electric field of 400 kV cm−1, multilayers are temperature stable up to 100 °C, frequency independent in the range 10−2 to 102 Hz, have low strain (<0.03%) and are fatigue-resistant up to 104 cycles (Wrec variation < 10%). These properties show promise for practical use in pulsed power systems.

Citation

Wang, G., Lu, Z., Yang, H., Ji, H., Mostaed, A., Li, L., Wei, Y., Feteira, A., Sun, S., Sinclair, D. C., Wang, D., & Reaney, I. M. (2020). Fatigue resistant lead-free multilayer ceramic capacitors with ultrahigh energy density. Journal of Materials Chemistry A, 8(22), 11414-11423. https://doi.org/10.1039/d0ta00216j

• Journal Article Type: Article
• Acceptance Date: May 12, 2020
• Online Publication Date: May 12, 2020
• Publication Date: 2020-06
• Deposit Date: Oct 23, 2021
• Publicly Available Date: Oct 25, 2021
• Journal: Journal of Materials Chemistry A
• Print ISSN: 2050-7488
• Electronic ISSN: 2050-7496
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 22
• Pages: 11414-11423
• DOI: https://doi.org/10.1039/d0ta00216j
• Public URL: http://researchrepository.napier.ac.uk/Output/2815510