Advanced Redox Flow Batteries

Market Opportunity

Redox flow batteries, for instance, vanadium redox flow batteries (VRBs) have attracted great attention for large-scale energy storage. However, VRBs suffer from a few crucial issues: high cost, low energy efficiency and narrow operation temperature range.  Also, the current trends to switch to renewable energy and electric vehicles increases the gap for affordable and high performing energy storage systems. This has led to creation of new battery systems that can fill the gap. 



NUS has developed a portfolio of technologies consisting of Condensed-phase Aqueous Redox-flow Battery (CARB), Redox Flow Lithium Battery (RFLB) and Lithium Metal-Air Batteries, including novel catholyte, anolyte and membrane materials for these systems.  In this novel flow battery, the energy is stored in the solid materials, which are kept in two separate tanks, while power is released in the electrochemical cell when the redox mediators in electrolytes are circulated through the storage tanks and regenerate the materials via reversible chemical reduction and oxidation. As a result, the energy density of this system is higher than that of the state-of-the-art flow battery systems. In addition, the cost of this system is much lower than current flow batteries, using cheap solid materials to replace expensive electrolytes. 



Stage of Development

TRL 5. 1kWh prototype built and tested in simulated environment.


Flow batteries are mainly used for large (1 kWh – 10 MWh) scale applications:

  • renewable energy storage, stand-alone power systems, 
  • peak shaving and load levelling, smart grids, electric vehicles


  1. 2-5 times more energy density of conventional VRB; Superior power density as compared to VRB
  2. Lower cost by eliminating the vanadium species and introducing cheap and robust H+-storage material 
  3. Less corrosive acidic electrolytes; Wider operation temperature range up to 80 degrees celsius


Available for licensing. R&D collaboration/Co-development, Test-bed opportunity in an operational environment. 


Get in Touch

Prasanna Shiridi
Phone: +65-65163622
ILO Ref No: 11179N, 15141N, 15170N, 15183N, 2016-227

Prof. Wang Qing