We produce the highly crosslinked,low cost ion exchange membrane with low vanadium ion permeability

Perfluorinated Sulfonic Acid Proton Exchange Membrane For Vanadium Flow Batteries

Technical Specifications(Reference Standard):

Item	Index	Testing Method
Thickness Increase	10% ( 23℃, from 50% RH to water soakage )	ASTM756
Thickness Increase	15% ( 100℃, from 50% RH to water soaked )	ASTM756
Length Increase	10% ( 23℃, from 50% RH to water soakage )	ASTM756
Length Increase	15% ( 100℃, from 50% RH to water soaked )	ASTM756
Tensile strength	38 MPa ( 23℃, 50% RH, Isotropy)	ASTMD882
Water content	4% ( 23℃,relative humidity is 50% )	ASTMD570
Water Absorption	50±5% ( 100℃, 1h)	ASTMD570
Electrical conductivity	0.1 S/cm
Acid Capacity	0.1 meq/g
Elongation at break	183%	ASTMD882
Density	1.98

The perfluorinated sulfonic acid ion exchange membranes for vanadium redox battery VRFB, is also called the proton exchange membranes, are produced with the new casting method, the casting process can be combined with doping technology,for the vanadium flow batteries, we add nano-graphene material into the ion exchange membrane during the casting process,our ion exchange membrane perform better than the traditional ion exchange membrane,we improve the strength, moisture retention and vanadium resistance of the ion exchange membranes.
The Vanadium Redox Battery(VRB) is a redox battery that uses vanadium as an active material to circulate in a liquid state.

The Principles of vanadium redox flow battery

The electric energy of the vanadium redox battery is stored in the sulfuric acid electrolyte of vanadium ions with different valences in the form of chemical energy. The electrolyte is pressed into the battery stack by an external pump. Under the action of mechanical power, it is stored in different liquid storage tanks and the half-cell circulates in a closed loop. The proton exchange membrane is used as the battery pack separator. The electrolyte solution flows in parallel across the electrode surface and undergoes an electrochemical reaction. The current is collected and conducted through the double electrode plate, so that the chemical energy stored in the solution converted into electricity. This reversible reaction process enables the vanadium battery to be successfully charged, discharged and recharged. The positive electrolyte is composed of V (Ⅴ) and V (Ⅳ) ionic solutions. The negative electrolyte is composed of V (Ⅲ) and V (Ⅱ) ionic solutions. After the battery is charged, the positive substance is a V (Ⅴ) ion solution and the negative electrode is V (Ⅱ) ion solution. After the battery is discharged, the positive and negative electrodes are V (Ⅳ) and V (Ⅲ) ion solutions, respectively. The inside of the battery conducts electricity through H +. V (Ⅴ) and V (Ⅳ) ions exist in the form of VO2 + ions and VO2 + ions, respectively. The positive and negative reactions of vanadium redox battery can be expressed as follows:
VO2 ++ 2H ++ e﹣ = VO2 ++ H2O
V2 + ﹣e﹣ = V3 +

Thickness and Weight:

Thickness（μm）	Weight（g/m2）
51	100
64	125
76	150
89	176
89	176
102	200
127	250
183	360
254	500

Remarks:The thickness is approximate number, we do not assure absolute precision. Please contact with our salesman if special thickness is requested.

Applications:

The Perfluorinated Sulfonic Acid Ion-Exchange Membrane is used for vanadium flow batteries.

Packing:

Our Perfluorinated Ion-Exchange Membrane has sheet and continuous roll:
Sheet material standard size:600mm*600mm;800mm*800mm;1000mm*1000mm
Continuous Roll: 800mm width and 680mm with continuous roll
We can also provide special customized size according to your requirement.
Standard packing is packaging the PIEM in plastic drum or bucket.