Gradient-Structured Ceramics with High Energy Storage Performance and Excellent Stability |
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Authors: | Fei Yan Guanglong Ge Jin Qian Jinfeng Lin Chukai Chen Zhifu Liu Jiwei Zhai |
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Affiliation: | 1. School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, 710126 P. R. China;2. Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University, Shanghai, 201804 P. R. China;3. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899 P. R. China |
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Abstract: | Owing to the high power density, eco-friendly, and outstanding stability, the lead-free ceramics have attracted great interest in the fields of pulsed power systems. Nevertheless, the low energy storage density of such ceramics is undoubtedly a severe problem in practical applications. To overcome this limitation, the lead-free ceramics with gradient structures are designed and fabricated using the tape-casting method herein. By optimizing the composition and distribution of the gradient-structured ceramics, the energy storage density, and efficiency can be improved simultaneously. Under a moderate electric field of 320 kV cm−1, the value of recoverable energy storage density (Wrec) is higher than 4 J cm−3, and the energy storage efficiency (η) is of ≥88% for 20-5-20 and 20-10-20. Furthermore, the gradient-structured ceramics of 20-10-0-10-20 and 20-15-0-15-20 possess high applied electric field, large maximum polarization, and small remnant polarization, which give rise to ultrahigh Wrec and η on the order of ≈6.5 J cm−3 and 89–90%, respectively. In addition, the energy storage density and efficiency also exhibit excellent stability over a broad range of frequencies, temperatures, and cycling numbers. This work provides an effective strategy for improving the energy storage capability of eco-friendly ceramics. |
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Keywords: | Bi0.5Na0.5TiO3 energy storage gradient structures lead-free ceramics stability |
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