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.

• 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