VRB-MEM50 | 50μm VRB membrane


Main features
  • Designed as cation (proton) exchange membranes for redox flow batteries
  • High acid capacity and conductivity for improved performance
  • Extended service life

Product Description

LINQCELL VRB-MEM50 is a 50 µm-thick perfluorinated cation exchange membrane produced through solution casting. This chemistry and manufacturing method provide several benefits, including high acid capacity and conductivity, enhanced crystallinity and tensile strength, reduced linear expansion and anisotropy, and an extended service life. These characteristics make LINQCELL VRB-MEM75 highly recommended for use as ion exchange membranes in redox flow batteries, particularly in all-vanadium flow batteries.

Key Features:

  • High Ionic Conductivity and Acid Capacity: High ionic conductivity and acid capacity enable efficient ion transport within the flow battery stack, supporting optimal electrochemical performance. When used in vanadium redox flow battery stacks, the Coulombic efficiency was as high as 96%. This value is not standard and will vary depending on the battery design, including factors such as electrode thickness and electrolyte concentration.
  • Good Mechanical and Hydrolytic Properties: High tensile strength, low anisotropy, and minimal linear expansion upon conditioning ensure the membrane remains stable and durable under operational conditions.
  • Long Service Life: With a service life >100,000 hours, LINQCELL VRB-MEM75 offers exceptional durability, reducing maintenance and replacement costs while improving reliability for continuous operation.

Highly Recommended As:

LINQCELL VRB-MEM50 is part of the LINQCELL VRB-MEM Membrane Series, which offers two standard thicknesses: 50 µm (VRB-MEM50) and 75 µm (VRB-MEM75). These membranes can also be custom-fabricated to meet specific requirements, with a maximum roll width of 75 cm. Both VRB-MEM50 and VRB-MEM75 are supplied in the dry, acid (H+) form.

Product Family
VRB-MEM50  
M2

Catalog Product

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Packaging
TDS, SDS & Technical documents

Technical Specifications

Hydrolytic Properties
Water Uptake 49 %
General Properties
Specific Gravity
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
 2
Total Thickness
Total Thickness
Total thickness is taking into account all the films, coatings, adhesives, release liners and special layers and is the maximum thickness of a film or tape.
 73–77 μm
Physical Properties
Young's modulus 600 MPa
Mechanical Properties
Elongation
Elongation
Elongation is the process of lengthening something.

It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks.

It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
 >160 %
Tensile Strength
Tensile Strength
The tensile strength of a material is the maximum amount of tensile stress that it can withstand while being stretched or pulled before failure.

Some materials break very sharply, without plastic deformation, in what is called a brittle failure. Others, which are more ductile, including most metals, experience some plastic deformation and possibly necking before fracture.
Tensile Strength
Tensile Strength
Tensile strength determines the resistance of a material to break under tension and it measures how much elongating load (or tensile stress) it can handle before fracture.

To make it simple, it measures how much force we have to apply when pulling apart a material before it breaks.
 38/38 (MD/TD) MPa

Additional Information

Properties and Performance of LINQCELL VRB-MEM Series in Vanadium Redox Flow Batteries

Property VRB-MEM50 VRB-MEM75 Unit
Physical Properties
Thickness 50 (±2) 75 (±2) µm
Specific Gravity 2 –
Tensile Strength (MD/TD) 38/38 MPa
Modulus 600 MPa
Elongation to Break 160 %
Hydrolytic Properties
Water Content1 5 %
Water Uptake2 49 %

Linear Expansion from 23 °C, 50% RH

to water soaked, 23 °C

to water soaked, 100 °C

 

3

5

 %
Other Properties
Available Acid Capacity 1 meq/g
Conductivity 0.1 S/cm
Hydrogen Permeability 0.008 N/A

mL/(min⋅cm)
Performance in Vanadium Redox Flow Batteries
Voltage Efficiency 90 90 %
Energy Efficiency 86 87 %
Coulombic Efficiency 95.6 96.7 %

1Water content of the membrane conditioned at 23 °C and 50% relative humidity, based on dry weight.

2Water absorption from a dry membrane to a conditioned state in water at 100 °C for 1 hour, based on dry weight.