Yan Fei, Bai Hairui, Ge Guanglong, Lin Jinfeng, Zhu Kun, Li Guohui, Qian Jin, Shen Bo, Zhai Jiwei, Liu Zhifu
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.
Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China.
Small. 2022 Aug;18(34):e2202575. doi: 10.1002/smll.202202575. Epub 2022 Jul 30.
Owing to the current global scenario of environmental pollution and the energy crisis, the development of new dielectrics using lead-free ceramics for application in advanced electronic and energy storage systems is essential because of the high power density and excellent stability of such ceramics. Unfortunately, most of them have low breakdown strength and/or low maximum polarization, resulting in low energy density and efficiency. To overcome this limitation here, lead-free ceramics comprising a layered structure are designed and fabricated. By optimizing the distribution of the layered structure, a large maximum polarization and high applied electric field (>500 kV cm ) can be achieved; these result in an ultrahigh recoverable energy storage density (≈7 J cm ) and near ideal energy storage efficiency (≈95%). Furthermore, the energy storage performance without obvious deterioration over a broad range of operating frequencies (1-100 Hz), working temperatures (30-160 °C), and fatigue cycles (1-10 ). In addition, the prepared ceramics exhibit extremely high discharge energy density (4.52 J cm ) and power density (405.50 MW cm ). Here, the results demonstrate that the strategy of layered structure design and optimization is promising for enhancing the energy storage performance of lead-free ceramics.
由于当前全球环境污染和能源危机的形势，开发用于先进电子和储能系统的无铅陶瓷新型电介质至关重要，因为此类陶瓷具有高功率密度和出色的稳定性。不幸的是，它们中的大多数具有低击穿强度和/或低最大极化强度，导致能量密度和效率较低。为克服这一限制，本文设计并制备了具有层状结构的无铅陶瓷。通过优化层状结构的分布，可以实现大的最大极化强度和高外加电场（>500 kV/cm）；这些因素导致了超高的可恢复储能密度（≈7 J/cm³）和接近理想的储能效率（≈95%）。此外，储能性能在很宽的工作频率范围（1 - 100 Hz）、工作温度范围（30 - 160 °C）和疲劳循环次数（1 - 10⁶）内均无明显劣化。另外，制备的陶瓷表现出极高的放电能量密度（4.52 J/cm³）和功率密度（405.50 MW/cm³）。在此，结果表明层状结构设计和优化策略对于提高无铅陶瓷的储能性能具有广阔前景。
