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NEPEM Proton exchange membrane for vanadium flow battery

The strength, moisture retention, and vanadium resistance of proton exchange membranes are enhanced by incorporating special materials into the tape casting process.

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NEPEM Proton Exchange Membrane for Vanadium Flow Battery


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

For Vanadium Flow Battery Applications

Thickness and Weight Properties
Membrane Type Thickness (ฮผm) Weight (g/mยฒ)
N-115 125 246
N-117 175 345
N-1110 220 432
N-115W, N-116W, N-117W 125, 150, 175 246, 295, 345

Physical Properties
Physical Properties Index Parameters – N-11 Series Index Parameters – N-11W Series
Tensile Test (23ยฐC, 50% RH) N-11 Series N-11W Series
Tensile Strength (MPa) โ‰ฅ28 โ‰ฅ28
Tensile Modulus (MPa) โ‰ฅ400 โ‰ฅ200
Elongation at Break (%) โ‰ฅ120 โ‰ฅ200
Specific Gravity 1.97 1.98
Other Properties Index Parameters
Conductivity (S/cm) โ‰ฅ0.100 โ‰ฅ0.100
Acid Capacity (meq/g) 1.00ยฑ0.05 1.00ยฑ0.05
Dissolved Hydrogen Concentration (ppb, Max) 1000

Hydrolytic Properties
Hydrolytic Properties Technical Indicators – N-11 Series Technical Indicators – N-11W Series
Water Content (%) 5.0ยฑ3.0 5.0ยฑ3.0
Water Uptake (%) 50.0ยฑ5.0 50.0ยฑ5.0
Thickness Change (23โ„ƒ, 50% RH) (% Increase)
– Water Soaked at 23โ„ƒ (50% RH, %) โ‰ค5 โ‰ค18
– Water Soaked at 100โ„ƒ (50% RH, %) โ‰ค15 โ‰ค30
Linear Expansion (23โ„ƒ, 50% RH) (% Increase)
– Water Soaked at 23โ„ƒ (50% RH, %) โ‰ค5 โ‰ค16
– Water Soaked at 100โ„ƒ (50% RH, %) โ‰ค18 โ‰ค20

Measurement Notes:

  1. Measurements were taken with the membrane conditioned at 23 ยฐC and 50% relative humidity (RH).
  2. Conductivity measurements were performed at 23 ยฐC and 100% relative humidity (RH).
  3. A base titration procedure is used to determine the equivalents of sulfonic acid groups in the polymer resin, which is then applied to calculate the acid capacity or equivalent weight of the membrane.
  4. Dissolved hydrogen concentration was measured using a hydrogen-rich water test pen (ENH-1000 Portable Dissolved Hydrogen Meter), based on the principle of oxidation-reduction potential (ORP) in the solution to calculate the dissolved hydrogen concentration.
  5. Water content of the membrane (dry weight basis) was determined with the membrane conditioned at 23 ยฐC and 50% relative humidity (RH).
  6. Water uptake (dry weight basis) was measured by conditioning the dry membrane in water at 100 ยฐC for 1 hour.

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