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Towards a thermally regenerative all-copper redox flow battery
Pekka Peljo1, David Lloyd, Nguyet Doan
1Department of Chemistry, Aalto University, B.O. Box 16100, 00076 Aalto, Finland. david.lloyd@aalto.fi.
Physical Chemistry Chemical Physics : PCCP
|January 15, 2014
Summary
This study demonstrates an all-copper redox flow battery using acetonitrile complexation for reasonable performance. The battery can be recharged using heat (100 °C) to distill acetonitrile, recovering starting materials.
Area of Science:
- Electrochemistry
- Materials Science
- Chemical Engineering
Background:
- Redox flow batteries (RFBs) are crucial for grid-scale energy storage.
- Copper-based RFBs offer potential cost advantages but face challenges with copper ion stability and solubility.
- Acetonitrile's strong complexation with Cu(+) presents an opportunity to stabilize copper ions in RFBs.
Purpose of the Study:
- To demonstrate an all-copper redox flow battery utilizing the strong complexation of copper(I) (Cu(+)) with acetonitrile.
- To investigate the battery performance and charging mechanism.
- To explore a novel, heat-assisted recharging method.
Main Methods:
- Fabrication of an all-copper redox flow battery cell.
- Electrochemical cycling to assess battery performance.
- Thermal treatment at 100 °C to induce acetonitrile distillation and observe material recovery.
Main Results:
- The all-copper RFB exhibited reasonable battery performance.
- Successful recharging of the battery was achieved by heating to 100 °C.
- Heat-induced distillation of acetonitrile destabilized the Cu(+) complex, enabling recovery of initial reactants.
Conclusions:
- An all-copper redox flow battery with stable Cu(+) complexation in acetonitrile is feasible.
- A novel thermal recharging strategy offers a sustainable method for battery regeneration.
- This approach advances the development of cost-effective and efficient energy storage solutions.
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