公开(公告)号：US11482721B2

公开(公告)日：2022-10-25

申请号：US16570253

申请日：2019-09-13

Applicant: UNIVERSITY OF SOUTH CAROLINA

Inventor： Brian C. Benicewicz ,  Laura Murdock ,  Lihui Wang ,  Fei Huang ,  Andrew Pingitore

IPC: H01M8/1081 ,  H01M8/1086 ,  H01M8/18 ,  H01M8/1032 ,  H01M8/1044 ,  H01M8/1067 ,  H01M8/1027

Abstract: Disclosed are redox flow battery membranes, redox flow batteries incorporating the membranes, and methods of forming the membranes. The membranes include a densified 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 followed by densification of the gel membrane. The densified membranes are then imbibed with a redox flow battery supporting electrolyte such as sulfuric acid and can operate at very high ionic conductivities of about 50 mS/cm or greater and with low permeability of redox couple ions, e.g. vanadium ions, of about 10−7 cm2/s or less. Redox flow batteries incorporating the membranes can operate at current densities of about 50 mA/cm2 or greater.

公开(公告)号：US11799112B2

公开(公告)日：2023-10-24

申请号：US17686631

申请日：2022-03-04

Applicant: UNIVERSITY OF SOUTH CAROLINA

Inventor： Brian C. Benicewicz ,  Laura Murdock ,  Lihui Wang ,  Fei Huang ,  Andrew Pingitore

IPC: H01M8/1027 ,  H01M4/92 ,  H01M4/88 ,  H01M8/1032 ,  H01M8/1048 ,  H01M8/1067 ,  H01M8/1081 ,  H01M8/1044 ,  H01M4/86

CPC classification number: H01M8/1027 ,  H01M4/8828 ,  H01M4/92 ,  H01M8/1032 ,  H01M8/1044 ,  H01M8/1048 ,  H01M8/1067 ,  H01M8/1081 ,  H01M4/8605

Abstract: 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.

公开(公告)号：US11302948B2

公开(公告)日：2022-04-12

申请号：US16570290

申请日：2019-09-13

Applicant: UNIVERSITY OF SOUTH CAROLINA

Inventor： Brian C. Benicewicz ,  Laura Murdock ,  Lihui Wang ,  Fei Huang ,  Andrew Pingitore

IPC: H01M8/1027 ,  H01M4/92 ,  H01M4/88 ,  H01M8/1032 ,  H01M8/1048 ,  H01M8/1067 ,  H01M8/1081 ,  H01M8/1044 ,  H01M4/86

Abstract: 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.