Disclosed are redox flow battery membranes, redox flow batteries incorporating the membranes, and methods of forming the membranes. The membranes include a polybenzimidazole gel membrane that is capable of incorporating a high liquid content without loss of structure that is formed according to a process that includes in situ hydrolysis of a polyphosphoric acid solvent. The membranes are imbibed with a redox flow battery supporting electrolyte such as sulfuric acid and can operate at very high ionic conductivities of about 100 mS/cm or greater. Redox flow batteries incorporating the PBI-based membranes can operate at high current densities of about 100 mA/cm2 or greater.
Benicewicz, Brian C., et al. "Polybenzimidazole (PBI) membranes for redox flow batteries." US 11,302,948, United States Patent and Trademark Office, Apr. 2022.
Benicewicz, Brian C., Murdock, Laura, Wang, Lihui, et al., "Polybenzimidazole (PBI) membranes for redox flow batteries," US 11,302,948, issued April 12, 2022.
@misc{osti_1892831,
author = {Benicewicz, Brian C. and Murdock, Laura and Wang, Lihui and Huang, Fei and Pingitore, Andrew},
title = {Polybenzimidazole (PBI) membranes for redox flow batteries},
annote = {Disclosed are redox flow battery membranes, redox flow batteries incorporating the membranes, and methods of forming the membranes. The membranes include a polybenzimidazole gel membrane that is capable of incorporating a high liquid content without loss of structure that is formed according to a process that includes in situ hydrolysis of a polyphosphoric acid solvent. The membranes are imbibed with a redox flow battery supporting electrolyte such as sulfuric acid and can operate at very high ionic conductivities of about 100 mS/cm or greater. Redox flow batteries incorporating the PBI-based membranes can operate at high current densities of about 100 mA/cm2 or greater.},
url = {https://www.osti.gov/biblio/1892831},
place = {United States},
year = {2022},
month = {04},
note = {US Patent