Superior energy storage performance achieved in tungsten bronze SBCN-based ceramics through tape-casting

• Published in: Journal of alloys and compounds Vol. 1002; p. 175469
• Main Authors: You, Yangfan, Tian, Mengping, Chai, Qizhen, Tong, Yihan, Liang, Pengfei, Wu, Di, Chao, Xiaolian, Yang, Zupei, Wei, Lingling
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2024
• Subjects: Energy storage performance; Relaxor; Tape-casting method; Tungsten bronze; Two-step sintering; Two-step sintering; Relaxor; Energy storage performance; Tungsten bronze; Tape-casting method
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2024.175469

Simultaneously integrating outstanding energy storage density and good energy storage efficiency in advanced ferroelectrics is crucial to implementing the application of dielectrics in high-power pulse devices. In this work, (Sr0.5Ba0.5)2Ca0.5Nb5-xSbxO15 ceramics were designed and prepared by adopting the B sites substitution engineering together with combining strategies of tape-casting method and two-step sintering process. Benefiting from the refined grain size and high density, the breakdown field of (Sr0.5Ba0.5)2Ca0.5Nb4.8Sb0.2O15 (SBCNS0.2) was promoted to 400 kV/cm. By the substitution of Sb5+ in the B sites, the weaker interaction force of Sb-O bond in BO6 octahedral polar unit induced the occurrence of polar nanoregions (PNRs) at room temperature to strengthen the dielectric relaxation behavior. Then it is noteworthy that SBCNS0.2 ceramics simultaneously obtained excellent recoverable energy density (Wrec, 3.9 J/cm3), energy storage efficiency (η, 90.5 %), power density (PD, 156.0 MW/cm3), and current density (CD, 1356.7 A/cm2). In addition, the SBCNS0.2 ceramics exhibited an ultrafast discharge time (t0.9, 67 ns). These results reveal prospective potential of unfilled tungsten bronze SBCNS0.2 ceramics in power capacitor applications and provide an effective strategy for improving excellent energy storage properties from the perspective of preparation methods. •Relaxor behavior at room temperature was greatly enhanced through the substitution of Sb5+ in B site.•Refined grains and high breakdown field strength were achieved by combining a two-step sintering process with tape-casting.•SBCNS0.2 sample displays an excellent Wrec 3.9 J/cm3, a superior η 90.5%, a large CD 1356.7 A/cm2 and a fast t0.9 67 ns.