期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130475
关键词
Environment-friendly; Excellent stability; Lead-free ceramics; Polymorphic PNRs; Polarization mismatch
资金
- National Natural Science Foundation of China [52073235]
- Fundamental Research Funds for the Central Universities [SWU119048]
This paper discusses a design strategy to achieve high-performance lead-free ceramic materials with excellent energy storage performance and temperature stability through phase structure control.
With the rapid growth of electronic devices towards to miniaturization and integration, the Pb-free ceramic materials with excellent recoverable energy storage density and efficiency are extremely required for the real application of pulse power capacitors. Moreover, it is also a huge challenge to sustain excellent energy storage performance in a dynamic temperature. The paper proposed a design strategy for building the co-existence of polymorphic PNRs through phase structure control. Based on the strategy, (1-x)(0.94Bi0.5Na0.5TiO3-0.06BaTiO3)xBiMg2/3Nb1/3O3 ((BNT-BT)-xBMN) solid-solution was engineered and synthesized to achieve co-existence of tetragonal and rhombohedral phase PNRs in the perovskite structure. The pinch phenomenon of the P-E loops is linked with the phase transition caused by the electrical field. High polarization with limited hysteresis has been achieved, taking advantage of ample hybridization between O2- 2p and Bi3+ 6p orbitals for polarization and increased structural disorder caused by composition modification. With the further enhancement of the electrical breakdown strength by the rolling process, an ultra-high energy density of 6.3 J/cm3, an improved energy efficiency of 79.6% and an excellent temperature stability (Wrec > 5.03 J/cm3, eta > 82%, and a small variation of Wrec (less than 10%) in the temperature range of 30 to 170 C) were achieved. The current work shows that this strategy is very important and successful in the design of high-performance Pb-free dielectric capacitors for real applications in the future.
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