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Updated: May 29, 2026
09:49
A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
Chloride supporting electrolytes for all-vanadium redox flow batteries.
Soowhan Kim1, M Vijayakumar, Wei Wang
1Pacific Northwest National Laboratory (PNNL), Richland, WA 99352, USA.
Physical Chemistry Chemical Physics : PCCP
|September 17, 2011
Summary
Vanadium chloride electrolytes offer high stability and efficiency for all-vanadium redox flow batteries. This breakthrough promises reduced costs for large-scale energy storage applications.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- All-vanadium redox flow batteries (VRFBs) are crucial for grid-scale energy storage.
- Developing stable and high-concentration electrolytes is key to improving VRFB performance and reducing costs.
- Current VRFB electrolytes face challenges with stability and vanadium solubility.
Purpose of the Study:
- To investigate vanadium chloride solutions as electrolytes for all-vanadium redox flow batteries.
- To assess the stability and performance of these novel electrolytes.
- To determine the potential for cost reduction in stationary energy storage applications.
Main Methods:
- Preparation and characterization of vanadium chloride solutions.
- Testing electrolyte stability across a temperature range (0-50 °C).
- Performance evaluation of all-vanadium redox flow batteries using the developed electrolytes.
Main Results:
- Vanadium chloride solutions achieved high vanadium dissolution (>2.3 M) at varied valence states.
- Electrolytes exhibited excellent stability between 0-50 °C due to dinuclear complex formation.
- All-vanadium redox flow batteries showed high efficiencies, excellent reversibility, and negligible gas evolution.
Conclusions:
- Vanadium chloride electrolytes enhance stability and performance in all-vanadium redox flow batteries.
- The improved energy capacity and heat management reduce capital and life-cycle costs.
- Vanadium chloride redox flow batteries are a promising technology for stationary energy storage.
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