Yan Fei, Qian Jin, Lin Jinfeng, Ge Guanglong, Shi Cheng, Zhai Jiwei
School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, 710126, China.
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, China.
Small. 2024 Feb;20(7):e2306803. doi: 10.1002/smll.202306803. Epub 2023 Oct 6.
Lead-free dielectric capacitors have attracted significant research interest for high-power applications due to their environmental benefits and ability to meet the demanding performance requirements of electronic devices. However, the development of lead-free ceramic dielectrics with outstanding energy storage performance remains a challenge. In this study, environmentally friendly ceramic dielectrics with sandwich structures are designed and fabricated to improve energy storage performance via the synergistic effect of different dielectrics. The chemical compositions of the outer and middle layers of the sandwich structure are 0.35BiFeO -0.65SrTiO and Bi Na Sr TiO , respectively. The experimental and theoretical simulation results demonstrate that the breakdown strength is over 700 kV cm for prepare sandwich structure ceramics. As a result, an ultrahigh recoverable energy storage density of 9.05 J cm and a near-ideal energy storage efficiency of 97% are simultaneously achieved under 710 kV cm . Furthermore, the energy storage efficiency maintains high values (≥ 96%) within 1-100 Hz and the power density as high as 188 MW cm under 400 kV cm . These results indicate that the designed lead-free ceramics with a sandwich structure possess superior comprehensive energy storage performance, making them promising lead-free candidates in the energy storage field.
无铅介电电容器因其环境效益以及满足电子设备苛刻性能要求的能力，在高功率应用中引起了广泛的研究兴趣。然而，开发具有优异储能性能的无铅陶瓷电介质仍然是一项挑战。在本研究中，设计并制备了具有三明治结构的环保型陶瓷电介质，以通过不同电介质的协同效应提高储能性能。三明治结构的外层和中间层的化学成分分别为0.35BiFeO -0.65SrTiO和Bi Na Sr TiO。实验和理论模拟结果表明，制备的三明治结构陶瓷的击穿强度超过700 kV/cm。结果，在710 kV/cm下同时实现了9.05 J/cm的超高可恢复储能密度和97%的近乎理想的储能效率。此外，储能效率在1-100 Hz范围内保持较高值（≥96%），在400 kV/cm下功率密度高达188 MW/cm。这些结果表明，所设计的具有三明治结构的无铅陶瓷具有优异的综合储能性能，使其成为储能领域有前景的无铅候选材料。
