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Robust Adamantane-Based Membranes with Enhanced Conductivity for Vanadium Flow Battery Application.
Bengui Zhang1,2, Xueting Zhang1, Qian Liu2
1College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China.
Polymers
|April 23, 2022
Summary
New adamantane-based membranes significantly improve vanadium flow battery performance. These robust membranes offer high conductivity and selectivity, overcoming previous limitations for high-power-density energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- High-power-density vanadium flow batteries (VFBs) require membranes with high conductivity, selectivity, and stability.
- Existing membranes often compromise selectivity and mechanical strength when conductivity is enhanced.
- Adamantane-based polymers offer a promising route to overcome these challenges due to their inherent rigidity and stability.
Purpose of the Study:
- To develop novel, robust adamantane-based membranes for enhanced VFB performance.
- To improve membrane conductivity without sacrificing selectivity and mechanical strength.
- To investigate the effect of selective swelling on membrane properties and VFB efficiency.
Main Methods:
- Incorporation of basic piperazine and hydroxyl groups into a rigid, hydrophobic adamantane-containing poly(aryl ether ketone) (PAPEK) backbone.
- Selective swelling of the PAPEK membranes at controlled temperatures to induce microphase separation and create ion transport pathways.
- Characterization of membrane properties including conductivity, selectivity, swelling, and mechanical strength.
- Assembly and testing of a VFB using the developed PAPEK membranes to evaluate energy efficiency and cycling stability.
Main Results:
- The rigid PAPEK backbone provided excellent swelling resistance, leading to slight swelling, high selectivity, and robust mechanical strength.
- Selective swelling temperature critically influenced membrane performance; PAPEK-130 membranes (swelled at 130 °C) exhibited low areal resistance (0.22 Ω·cm²).
- VFBs utilizing PAPEK-90 membranes demonstrated high energy efficiency (91.7% at 80 mA·cm⁻², 80.0% at 240 mA·cm⁻²) and stable cycling over 2000 cycles.
Conclusions:
- The developed adamantane-based PAPEK membranes effectively balance high conductivity, selectivity, and stability for VFB applications.
- Selective swelling is a crucial parameter for optimizing ion transport pathways and reducing areal resistance.
- These advanced membranes show significant potential for improving the performance and durability of high-power-density vanadium flow batteries.
