Energy-storage properties of low-temperature Co-fired BNT-ST/AgPd multilayer lead-free ceramic capacitors

• Published in: Journal of alloys and compounds Vol. 827; p. 154260
• Main Authors: Tong, Xing-Ye, Yang, Yu-Ting, Song, Min-Wei, Zhou, Jia-Jun, Wang, Ke, Guan, Chun-Lin, Liu, Hong, Fang, Jing-Zhong
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.06.2020; Elsevier BV
• Subjects: Additives; Capacitors; Ceramics; Composition; Electric fields; Energy storage; Energy storage properties; Free energy; Lead free; Lead-free piezoceramics; Low temperature; Manganese dioxide; Multilayer ceramic capacitor; Multilayers; Na0.5Bi0.5TiO3; Niobium oxides; Tape casting; Lead-free piezoceramics; Multilayer ceramic capacitor; Na0.5Bi0.5TiO3; Energy storage properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.154260

A lead-free 0.6Bi0.5Na0.5TiO3-0.4SrTiO3 ceramic doped with Nb2O5, CuO and MnO2 additives (BNSr0.4TNbxCu0.8Mn0.15) was synthesized at a relatively low firing temperature of 1050 °C. Using this composition, multilayer ceramic capacitors with AgPd inner electrodes were successfully prepared by a tape-casting method for energy storage applications. Due to the high polarization Pmax and low hysteresis, the largest recoverable energy storage density Wrec value of 1.9 J/cc and high efficiency η of 89% were obtained in the BNSr0.4TNb2.5Cu0.8Mn0.15 composition under a low electric field of 170 kV/cm. The multilayer BNSr0.4TNb2.5Cu0.8Mn0.15/Ag75Pd25 capacitors contain 30 active layers, in which the thickness of a single ceramic layer was approximately 27 μm. Under a low electric field of 270 kV/cm, excellent energy storage performance was observed in multilayer capacitors, with a Wrec of 2.83 J/cc and η of 85%. The capacitors demonstrate the temperature insensitive properties that the variation in Wrec was less than 5% between 25 °C and 100 °C. These results indicate that this ceramic capacitor is a promising candidate for lead-free energy storage applications. •Multilayer lead-free ceramic capacitors fabricated at low sintering temperature (1050 °C).•BNT co-fired with low-cost Ag75Pd25 inner electrodes.•Excellent energy storage performance under a low electric field.•Thermally-insensitive energy-storage performance.