Asymmetric Porous Polybenzimidazole Membranes with High Conductivity and Selectivity for Vanadium Redox Flow Batteries,Energy Technology

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Asymmetric Porous Polybenzimidazole Membranes with High Conductivity and Selectivity for Vanadium Redox Flow Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2020-08-25 , DOI: 10.1002/ente.202000592
Lin Zeng _{1,

2} , Yuxun Ren ₁ , Lei Wei ₁ , Xinzhuang Fan ₁ , Tianshou Zhao ₁

Affiliation

Developing functional membrane with high conductivity and excellent stability is critical for improving the performance of vanadium redox flow batteries (VRFBs). Herein, an asymmetric porous polybenzimidazole (PBI) membrane composed of an ultra‐thin dense layer and a sponge‐like porous layer is proposed and prepared. The dense layer takes the main role of inhibiting vanadium crossover, whereas the porous layer provides not only a fast proton conduction channel but also a mechanical support to the dense layer. Hence, the asymmetric PBI membrane exhibits a high proton conductivity (36.4 mS cm⁻¹ at room temperature) and an extremely low vanadium permeability (0.26 × 10⁻⁷ cm² min⁻¹). The VRFB with this membrane achieves an energy efficiency of 83.17% at 400 mA cm⁻² and 78.59% at 500 mA cm⁻². Furthermore, the battery enables to be continuously cycled for 1600 times without a significant degradation at 400 mA cm⁻². All these results prove that the PBI membrane with an asymmetric porous structure is an ideal membrane for redox flow batteries.

中文翻译：

具有高电导率和选择性的钒氧化还原液流电池的不对称多孔聚苯并咪唑膜

开发具有高电导率和出色稳定性的功能膜对于改善钒氧化还原液流电池（VRFB）的性能至关重要。本文提出并制备了一种由超薄致密层和海绵状多孔层组成的非对称多孔聚苯并咪唑（PBI）膜。致密层起着抑制钒交叉的主要作用，而多孔层不仅提供了快速的质子传导通道，而且为致密层提供了机械支撑。因此，非对称PBI膜表现出高的质子传导性（室温下为36.4 mS cm ^-1）和极低的钒渗透性（0.26×10 ^-7 cm ² min ^-1））。带有该膜的VRFB在400 mA cm ^-2时达到83.17％的能量效率，在500 mA cm ^-2时达到78.59％的能量效率。此外，电池能够连续循环1600次而在400mA cm ^-2下没有明显的劣化。所有这些结果证明，具有不对称多孔结构的PBI膜是氧化还原液流电池的理想膜。

更新日期：2020-10-05

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