Sulfonated Polyphenylsulfone (SPPSU) Ion-Exchange Membrane for Vanadium Redox Flow Battery (VRFB), CVRFBIEMSPPSU
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In a Vanadium Redox Flow Battery (VRFB), the SPPSU (Sulfonated Polyphenylsulfone) membrane acts as the "gatekeeper." Its job is to allow protons (H^+) to pass through to complete the electrical circuit while blocking vanadium ions (V^{2+}, V^{3+}, VO^{2+}, VO2^+) from mixing.
Ion Selectivity: SPPSU has a high ion selectivity, which is the ratio of proton conductivity to vanadium permeability. Because the pores in SPPSU are generally smaller and less interconnected than those in perfluorinated membranes, the bulky vanadium ions find it much harder to "leak" through.
Capacity Retention: Because it blocks vanadium crossover so effectively, VRFBs using SPPSU often show much higher Coulombic Efficiency (CE) and slower capacity decay over hundreds of cycles.
| Part Number |
CVRFBIEMSPPSU (C-VRFB-IEM-SPPSU) |
| Chemical Formula/Structure |
 |
| Appearance |
Transparent |
| Sulfation Degree |
30% |
| Dimension |
T 25 or 50 um * L 100mm * W 100 mm (Other membrane sizes can be supplied upon request) |
| Ion Conductivity |
7.9 mS/cm |
| Tensile Strength |
40-45 MPa |
| Application Note |
(1) The 25 um thickness membrane is mainly used for high energy density field due to its low resistance (2) The 50 um thickness membrane is mainly used for long-term cycling filed due to its high blocking capability to vanadium ions. |
| Package Grade |
1 pcs/pack |
References
(1）B. P. Gindt, et al., Nanoporous polysulfone membranes via a degradable block copolymer precursor for redox flow batteries, J. Mater. Chem. A, 2016,4, 4288-4295.
(2) S. Swaby, et al., Block Copolymer-Based Membranes for Vanadium Redox Flow Batteries: Synthesis, Characterization, and Performance, ACS Appl. Polym. Mater. 2024, 6, 15, 8966–8976.