Li Xiaona, Luo Hang, Yang Chenchen, Wang Fan, Jiang Xun, Guo Ru, Zhang Dou
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan Province, P. R. China.
ACS Appl Mater Interfaces. 2023 Sep 6;15(35):41828-41838. doi: 10.1021/acsami.3c06778. Epub 2023 Aug 26.
Polymer dielectrics are crucial for use in electrostatic capacitors, owing to their high voltage resistance, high energy storage density, and ultrahigh reliability. Furthermore, high-temperature-resistant polymer dielectrics are applied in various emerging fields. Herein, poly(ether imide) (PEI)-based polymer dielectrics prepared by adding a low loading of dimethylimidazolium cobalt (ZIF-67) with a narrow bandgaps are investigated. The results show that the composites exhibit considerably increased Young's modulus, suppressed conductivity loss, and improved breakdown strength compared with pure PEI. Consequently, a stable energy storage performance is realized for ZIF-67/PEI composites. Particularly, at 150 °C, 1 wt % ZIF-67/PEI composite affords an excellent energy storage density of 4.59 J/cm with a discharge energy efficiency of 80.6%, exhibiting a considerable increase compared with the values obtained for PEI (2.58 J/cm with a discharge energy efficiency of 68.8%). The results of this study reveal a feasible pathway to design polymer dielectrics with the potential for use in capacitive applications in harsh environments.
聚合物电介质因其高耐压性、高储能密度和超高可靠性，在静电电容器中至关重要。此外，耐高温聚合物电介质应用于各种新兴领域。在此，研究了通过添加低负载量的具有窄带隙的二甲基咪唑钴（ZIF-67）制备的聚醚酰亚胺（PEI）基聚合物电介质。结果表明，与纯PEI相比，复合材料的杨氏模量显著提高，电导率损失得到抑制，击穿强度得到改善。因此，ZIF-67/PEI复合材料实现了稳定的储能性能。特别是在150℃时，1 wt%的ZIF-67/PEI复合材料具有4.59 J/cm的优异储能密度和80.6%的放电能量效率，与PEI（2.58 J/cm，放电能量效率68.8%）相比有显著提高。本研究结果揭示了一条设计聚合物电介质的可行途径，该聚合物电介质有潜力用于恶劣环境中的电容应用。
