Apexazole® Proton Exchange Membrane for Flow Batteries

Apexazole® PBI (polybenzimidazole) proton exchange membranes, with their unique positively charged polymer backbone structure, demonstrate outstanding performance advantages in large-scale energy storage applications. As a core technology for grid peak‑shaving, renewable‑energy integration, and distributed energy storage, all‑vanadium redox flow batteries impose extremely stringent requirements on ion‑conducting membrane performance. PBI membranes are renowned for their excellent chemical stability and dense microstructure; the positive charges carried along the polymer backbone can effectively repel vanadium ions (VO²⁺/VO₂⁺) via the Donnan effect, substantially reducing cross‑contamination between the two sides of the membrane and thereby significantly enhancing both the battery’s coulombic efficiency and its service life.

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Product Details

Apexazole® PBI (Polybenzimidazole) Proton exchange membranes—suitable for all‑vanadium, iron–chromium, and other systems—exhibit outstanding performance advantages in large‑scale energy storage thanks to their unique positively charged polymer backbone. As a core technology for grid peak‑shaving, renewable‑energy integration, and distributed energy storage, all‑vanadium redox flow batteries impose extremely stringent requirements on ion‑conducting membranes. PBI membranes are renowned for their excellent chemical stability and dense microstructure; the positive charges carried along their main chain can effectively repel vanadium ions (VO²⁺/VO₂⁺) via the Donnan effect, substantially reducing cross‑contamination between the two sides of the membrane and thereby significantly enhancing both the battery’s coulombic efficiency and its service life.

The core advantages of Zhongke Jinding’s PBI proton exchange membrane include:

High ionic conductivity: proton conductivity can reach 80–120 mS/cm.
High Coulombic efficiency: Coulombic efficiency exceeds 99.5%, effectively reducing battery self-discharge.
High energy efficiency: With an energy efficiency exceeding 83%, it enhances overall energy storage efficiency.
Excellent durability: remains stable in strong acid (3M H₂SO₄) and strong oxidizing environments (VO₂⁺), with a cycle life exceeding 1,000 cycles.
Excellent mechanical properties: tensile strength exceeds 120 MPa, with excellent thickness uniformity (available in multiple specifications ranging from 20 to 60 μm), meeting the demands of large-scale battery stack‑press assembly.
Clear cost advantage: the cost is only about one-third that of perfluorosulfonic acid membranes (Nafion).
Customizable specifications: Available in a variety of thicknesses, with widths also available for custom production.
Stringent quality standards: Products are rigorously tested in accordance with the NB/T 42080-2023 industry standard, achieving performance levels that are among the best in China.

Product Specifications

Performance Metrics	Unit	Parameter value	Test conditions	Testing standards
Width	mm	60	Standard environment	NB/T 42080-2023
Thickness	micrometer	20	Standard environment	NB/T 42080-2023
Puncture strength	MPa	≥8	Stretching speed: 10 mm/min	NB/T 42080-2023
Tensile strength	MPa	≥147		NB/T 42080-2023
Elongation at break	%	≥60		NB/T 42080-2023
Elastic modulus	MPa	≥2500		NB/T 42080-2023
Coulombic efficiency (CE)	%	≥99.5	160 mA/cm²	VRFB Test Standards
Energy Efficiency (EE)	%	≥85	160 mA/cm²	VRFB Test Standards
Voltage Efficiency (VE)	%	≥84	160 mA/cm²	VRFB Test Standards
Proton conductivity	mS/cm	≥80	25°C, RH=100%	NB/T 42080-2023