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An effective dual-channel strategy for preparation of polybenzimidazole separator for advanced-safety and high-performance lithium-ion batteries
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-19 , DOI: 10.1016/j.memsci.2021.119190
Xiaoting Liu , Yingnan Wu , Fan Yang , Shichao Wang , Bin Zhang , Lei Wang

Metal-organic framework (MOF) nanoparticles with an inherently ordered porous structure are a promising component for improving the safety of rechargeable batteries. However, a separator combining the polybenzimidazole (PBI) matrix and the MOF filler has not yet been developed to optimize lithium-ion batteries (LIBs). Here, an effective strategy has been designed to prepare the dual transport pathway separator containing poly (aryl ether benzimidazole) (OPBI) and the UiO-66 (zirconium-based MOF) filler using a phase separation method. The composite membranes show excellent properties, such as superior wettability, thermostability, flame resistance and interfacial compatibility, resulting from the interconnected porous network structure formed by the synergistic regulation of PBI porous structure and nano-MOF channels. Compared with the pristine OPBI separator, the composite separator (M40) containing 40% UiO-66 delivers a higher ionic conductivity, a significant improvement in LiFePO4/Li cell performance (151.6 mAh g−1), and an excellent rate capacity. Furthermore, the M40 exhibits the good uniformity of lithium electrodeposition and the effective inhibition of the lithium dendrite issues. The dual-channel strategy provides broader prospects for the application of the polybenzimidazole separator aided by the MOF crystals towards advanced-safety and high-performance LIBs.



中文翻译:

一种有效的双通道策略,用于制备用于高级安全和高性能锂离子电池的聚苯并咪唑隔膜

具有固有有序多孔结构的金属有机骨架(MOF)纳米粒子是提高充电电池安全性的有前途的组件。但是,尚未开发出结合聚苯并咪唑(PBI)基质和MOF填料的隔板来优化锂离子电池(LIB)。在这里,已经设计出一种有效的策略,以使用相分离方法制备包含聚(芳基醚苯并咪唑)(OPBI)和UiO-66(锆基MOF)填料的双传输路径分离器。复合膜表现出优异的性能,例如优异的润湿性,热稳定性,阻燃性和界面相容性,这是由PBI多孔结构和纳米MOF通道的协同调节形成的相互连接的多孔网络结构所致。4 / Li电池性能(151.6 mAh g -1)和出色的倍率容量。此外,M40具有良好的锂电沉积均匀性,并且可以有效抑制锂枝晶问题。双通道策略为借助MOF晶体的聚苯并咪唑分离器向先进安全和高性能LIB的应用提供了广阔的前景。

更新日期:2021-02-23
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