Energy storage performance of flexible NKBT/NKBT-ST multilayer film capacitor by interface engineering. (August 2020)

• Record Type: Journal Article
• Authors: Qian, Jin; Han, Yajie; Yang, Changhong; Lv, Panpan; Zhang, Xiaofang; Feng, Chao; Lin, Xiujuan; Huang, Shifeng; Cheng, Xin; Cheng, Zhenxiang
• Is Part Of: Nano energy. Volume 74(2020)
• Publication Date: 2020-08
• Subjects: Flexible -- Multilayer film -- Energy storage performance -- Wide temperature window -- Bending-endurance; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2020.104862
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Dielectric film capacitors with high energy density ( W rec ) and high efficiency ( η ) as well as good flexibility are highly desired in electrical power systems, which will be beneficial to the minimization and integration of the next generation advanced flexible electronic devices. Here, lead free (Na0.8 K0.2 )0.5 Bi0.5 TiO3 /0.6(Na0.8 K0.2 )0.5 Bi0.5 TiO3 -0.4SrTiO3 (NKBT/NKBT-ST)N multilayer films with different stacking periodic numbers (N = 2, 3, 6, 8) were constructed on mica substrate by combining the ferroelectric NKBT with large polarization and relaxor ferroelectric NKBT-ST with high breakdown strength ( E b ). Under a fixed film thickness, the W rec and η can be optimized by interface engineering. A giant W rec of ~73.7 J cm −3 and high η of ~68.1% are simultaneously obtained in the NKBT/NKBT-ST multilayer film with N = 6. The energy storage behaviors are quite stable and reliable in a wide temperature (−50 °C–200 °C) and frequency (500 Hz-20 kHz) ranges and even after 10 8 cycles. Meanwhile, with the assistance of mica substrate, the designed film capacitor exhibits excellent bending endurance, i.e., the W rec and η can be maintained well even under a small bending radius of r = 2 mm or after 10 4 bending cycles at r = 4 mm. All these characteristics make this flexible multilayer film capacitor potential for future applications. Graphical abstract: Flexible (Na0.8 K0.2 )0.5 Bi0.5 TiO3 /0.6(Na0.8 K0.2 )0.5 Bi0.5 TiO3 -0.4SrTiO3 (NKBT/NKBT-ST)N multilayer films with different stacking periodic numbers (N = 2, 3, 6, 8) were constructed on mica substrate by combining the ferroelectric NKBT with large polarization and relaxor ferroelectric NKBT-ST with high breakdown strength ( E b ) by carefully engineering the interfaces. NKBT/NKBT-ST multilayer film with N = 6 displays a greatly improved W rec ~73.7 J cm −3 with great η ~68.1%. Meanwhile, good thermal stability and mechanical bending endurance were realized in the film, which will speed up the development of flexible energy storage devices. Image 1 Highlights: High energy storage performance is realized by constructing multilayer structure. High W rec of 73.7 J cm −3 and η of 68.1% for (NKBT/NKBT-ST)N multilayer film with N = 6. The energy storage behavior of the film is quite stable from −50 °C to 200 °C. The designed film capacitor on mica substrate exhibits excellent bending endurance.