High energy storage performance in BaTiO3-based lead-free relaxors via multi-dimensional collaborative design |
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| Affiliation: | 1. Key Laboratory of Multifunctional Materials and Structures, Ministry of Education, School of Electronic Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, Shaanxi, China;2. School of Electronic and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;3. School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong 528000, China |
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| Abstract: | The application of advanced pulse power capacitors strongly depends on the fabrication of high-performance energy storage ceramics. However, the low recoverable energy storage density (Wrec) and energy efficiency (η) become the key links limiting the development of energy storage capacitors. In this work, a high Wrec of ～5.57 J cm?3 and a large η of ～85.6% are simultaneously realized in BaTiO3-based relaxor ceramics via multi-dimensional collaborative design, which are mainly attributed to the ferroelectric-relaxor transition, enhanced polarization, improved breakdown electric field, and delayed polarization saturation. Furthermore, the excellent temperature stability (ΔWrec < ± 5%, 25–140 °C), frequency stability (ΔWrec < ± 5%, 1–200 Hz), and outstanding charge/discharge performance (current density ～1583.3 A cm?2, power density ～190.0 MW cm?3) with good thermal stability are also achieved. It is encouraging that this work demonstrates that multi-dimensional collaborative design is a good strategy to develop new high-performance lead-free materials used in advanced dielectric capacitors. |
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| Keywords: | Energy storage Lead-free Relaxor ferroelectric Dielectric capacitor |
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