Description
The NEPEM Proton Exchange Membrane, engineered for vanadium flow battery systems, integrates specialized materials into a tape-casting fabrication process. This innovation enhances key performance metrics: mechanical strength to endure cyclic operational stresses, moisture retention for sustained ionic conductivity, and vanadium resistance to mitigate crossover-induced capacity decay. By addressing these critical challenges, the membrane ensures stable, long-lasting energy storage performance, making it a reliable choice for vanadium flow battery applications in grid-scale energy storage and renewable energy integration projects.
NEPEM Proton Exchange Membrane
| Membrane Type | Thickness (μm) | Basis Weight (g/m²) |
|---|---|---|
| N-212 | 50 | 99 |
| N-1125 | 62 | 122 |
| N-113 | 75 | 148 |
| N-1135 | 80 | 172 |
| N-114 | 100 | 197 |
| N-115 | 125 | 246 |
| Physical Properties | Index Parameters |
|---|---|
| Tensile Strength (MPa) | ≥30 |
| Elastic Modulus (MPa) | ≥400 |
| Elongation at Break (%) | ≥120 |
| Specific Gravity | 1.97 |
| Other Properties | Index Parameters |
|---|---|
| In-plane Conductivity (S/cm) | ≥0.100 |
| Normal Conductivity (S/cm) | ≥0.04 |
| Acid Capacity (meq/g) | 1.00±0.05 |
| Swelling Properties | Index Parameters |
|---|---|
| Water Content (%) | 5.0±3.0 |
| Water Uptake (%) | 50.0±5.0 |
| Thickness Swelling Rate (23℃, 50% RH), % increase | |
| Water soaked at 23℃, 50% RH (%) | ≤5 |
| Water soaked at 100℃, 50% RH (%) | ≤15 |
| Linear Expansion (23℃, 50% RH), % increase | |
| Water soaked at 23℃, 50% RH (%) | ≤5 |
| Water soaked at 100℃, 50% RH (%) | ≤18 |
Measurement Notes for NEPEM Proton Exchange Membrane for Vanadium Flow Battery
- Conductivity measurements were conducted at 23°C and 100% relative humidity (RH).
- A base titration procedure was used to determine the equivalents of sulfonic acid in the polymer, and this measurement was applied to calculate the acid capacity or equivalent weight of the membrane.
- Water content of the membrane conditioned at 23°C and 50% relative humidity (RH) (reported on a dry weight basis).
- Water uptake was measured by conditioning dry membranes in water at 100°C for 1 hour (reported on a dry weight basis).
- Tensile test was performed at 23°C and 50% relative humidity (RH).
- Normal conductivity was measured at 25°C in a 3 M H₂SO₄ solution.
- Measurements were taken with the membrane conditioned at 23°C and 50% relative humidity (RH) (applicable to thickness, basis weight, and swelling property tests unless specified otherwise).
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