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

Zeng，Lin1,2; Ren，Yuxun1; Wei，Lei1; Fan，Xinzhuang1; Zhao，Tianshou1

2020

10.1002/ente.202000592

Energy Technology   影响因子和分区

2194-4288

2194-4296

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 at room temperature) and an extremely low vanadium permeability (0.26 × 10 cm min). The VRFB with this membrane achieves an energy efficiency of 83.17% at 400 mA cm and 78.59% at 500 mA cm. Furthermore, the battery enables to be continuously cycled for 1600 times without a significant degradation at 400 mA cm. All these results prove that the PBI membrane with an asymmetric porous structure is an ideal membrane for redox flow batteries.

asymmetric membranes ion selectivity porous polybenzimidazole membranes proton conductivity vanadium redox flow batteries

SCI ; EI

英语

其他

Innovation and Technology Fund of the Hong Kong Special Administrative Region, China[ITS/177/17FP] ; Research Grants Council, University Grants Committee[T23-601/17-R]

Energy & Fuels

Energy & Fuels

WOS:000566801200001

WILEY-V C H VERLAG GMBH

20203709156642

Flow batteries ; Proton conductivity ; Energy efficiency ; Vanadium

Energy Conservation:525.2 ; Vanadium and Alloys:543.6 ; Electricity: Basic Concepts and Phenomena:701.1 ; Secondary Batteries:702.1.2 ; Materials Science:951

2-s2.0-85090310123

Scopus

1.Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Kowloon,Clear Water Bay,999077,Hong Kong
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zeng，Lin,Ren，Yuxun,Wei，Lei,et al. Asymmetric Porous Polybenzimidazole Membranes with High Conductivity and Selectivity for Vanadium Redox Flow Batteries[J]. Energy Technology,2020,8(10).

Zeng，Lin,Ren，Yuxun,Wei，Lei,Fan，Xinzhuang,&Zhao，Tianshou.(2020).Asymmetric Porous Polybenzimidazole Membranes with High Conductivity and Selectivity for Vanadium Redox Flow Batteries.Energy Technology,8(10).

Zeng，Lin,et al."Asymmetric Porous Polybenzimidazole Membranes with High Conductivity and Selectivity for Vanadium Redox Flow Batteries".Energy Technology 8.10(2020).