Lee, Wonmi Kwon, Byeong Wan Jung, Mina Serhiichuk, Dmytro Henkensmeier, Dirk Kwon, Yongchai 2024-01-19T19:01:31Z 2024-01-19T19:01:31Z 2021-09-04 2019-11 0378-7753 https://pubs.kist.re.kr/handle/201004/119407 An iron-vanadium redox flow battery utilizing 15 mu m thick HCl doped meta-polybenzimidazole (m-PBI) membranes is used. Ex-situ tests for m-PBI membranes show a much lower permeability for Fe2+ and V3+ ions than when using Nafion 212. Specifically, cells utilizing 50 mu m thick Nafion 212 show a strong electrolyte imbalance (catholyte moving to anolyte), a low charge efficiency (CE) of 90%, and a high capacity loss rate (CLR) of 0.63 Ahr.L-1 per cycle, indicating low energy efficiency and stability. In contrast to this, cells utilizing m-PBI reveal a CE of 99% and a CLR of just 0.11 Ahr.L-1 per cycle. After 20 cycles, the discharge capacity is three times higher than for the cell with Nafion 212. Since the polymer needed for a 15 mu m thick m-PBI membrane costs 97% less than for a 50 mu m thick Nafion membrane, the utilization of m-PBI membranes is also economically advantageous. English ELSEVIER Iron-vanadium redox flow batteries with polybenzimidazole membranes: High coulomb efficiency and low capacity loss Article 10.1016/j.jpowsour.2019.227079 1 JOURNAL OF POWER SOURCES, v.439 JOURNAL OF POWER SOURCES 439 N scie scopus 000494891700015 2-s2.0-85071698269 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article ALL-VANADIUM PERFORMANCE TEMPERATURE Meta-polybenzimidazole Fe-V redox flow batteries New membrane Charge efficiency