Highly efficient vanadium redox flow batteries enabled by a trilayer polybenzimidazole membrane assembly  

作　　者：Trung Tuyen Bui Mingyu Shin Mohammad Rahimi Anders Bentien Yongchai Kwon Dirk Henkensmeier 

机构地区：[1]Hydrogen·Fuel Cell Research Center,Korea Institute of Science and Technology(KIST),Seoul,Republic of Korea [2]Department of Chemical and Biomolecular Engineering,Seoul National University of Science and Technology,Seoul,Republic of Korea [3]Department of Biological and Chemical Engineering,Aarhus University,Aarhus,Denmark [4]KIST School,Division of Energy and Environment Technology,University of Science and Technology,Seoul,Republic of Korea [5]Graduate School of Energy and Environment,Korea University,Seoul,Republic of Korea

出　　处：《Carbon Energy》2024年第7期191-204,共14页碳能源（英文）

基　　金：supported by KIST (2E31871 and 2E32591)and Innovation Fund Denmark Denmark (DANFLOW—project#9090-00059);Korea Institute for Advancement of Technology (KIAT)through the International Cooperative R&D program (Project No.P0018437);Basic Science Research Program through the National Research Foundation of Korea (NRF)funded by the Ministry of Education (2021R1A6A1A03039981).

摘　　要：A novel polybenzimidazole(PBI)-based trilayer membrane assembly is developed for application in vanadium redox flow battery(VRFB).The membrane comprises a 1μm thin cross-linked poly[2,2′-(p-oxydiphenylene)−5,5′-bibenzimidazole](OPBI)sandwiched between two 20μm thick porous OPBI membranes(p-OPBI)without further lamination steps.The trilayer membrane demonstrates exceptional properties,such as high conductivity and low area-specific resistance(ASR)of 51 mS cm^(−1) and 81mΩ cm^(2),respectively.Contact with vanadium electrolyte increases the ASR of trilayer membrane only to 158mΩ cm^(2),while that of Nafion is 193mΩ cm^(2).VO^(2+) permeability is 2.73×10^(-9) cm^(2) min^(−1),about 150 times lower than that of Nafion NR212.In addition,the membrane has high mechanical strength and high chemical stability against VO^(2+).In VRFB,the combination of low resistance and low vanadium permeability results in excellent performance,revealing high Coulombic efficiency(>99%),high energy efficiency(EE;90.8% at current density of 80mA cm^(−2)),and long-term durability.The EE is one of the best reported to date.

关 键 词：POLYBENZIMIDAZOLE porous membrane proton conductivity TRILAYER VRFBs 

分 类 号：TM91[电气工程—电力电子与电力传动]