Variable Porous Electrode Compression for Redox Flow Battery Systems

Abstract

Vanadium redox flow batteries (VRFBs) offer great promise as a safe, cost effective means of storing electrical energy on a large scale and will certainly have a part to play in the global transition to renewable energy. To unlock the full potential of VRFB systems, however, it is necessary to improve their power density. Unconventional stack design shows encouraging possibilities as a means to that end. Presented here is the novel concept of variable porous electrode compression, which simulations have shown to deliver a one third increase in minimum limiting current density together with a lower pressure drop when compared to standard uniform compression cell designs.

Keywords

• vanadium redox flow battery
• electrode compression
• limiting current
• electrode porosity
• stationary model
• cell geometry
• mass transfer