An aqueous, polymer-based redox-flow battery using non-corrosive, safe, and low-cost materials

Area of Science:

• Electrochemistry
• Materials Science
• Renewable Energy Storage

Background:

• Renewable energy sources require flexible, scalable energy storage to manage output fluctuations.
• Redox-flow batteries (RFBs) are a promising large-scale energy storage technology, but face limitations.
• Current RFBs are constrained by expensive and corrosive materials, and limited long-term resource availability (e.g., vanadium, lithium).

Purpose of the Study:

• To develop an affordable, safe, and scalable energy storage solution for grid integration.
• To overcome the material limitations and costs associated with traditional RFB chemistries.
• To present a novel polymer-based RFB utilizing inexpensive and environmentally benign components.

Main Methods:

• Development of a redox-flow battery system using organic polymers as the charge-storage material.
• Utilized inexpensive dialysis membranes for anode and cathode separation.
• Employed an aqueous sodium chloride solution as the electrolyte.

Main Results:

• Achieved an energy density of 10 watt hours per litre.
• Demonstrated high current densities of up to 100 milliamperes per square centimetre.
• Exhibited stable long-term cycling capability.

Conclusions:

• The presented polymer-based RFB offers a safe, cost-effective, and scalable alternative for renewable energy storage.
• This system utilizes environmentally benign materials (water, NaCl, organic polymers) and commercially available membranes.
• The technology shows potential for widespread adoption in future grid energy storage applications.