Capacity balancing for vanadium redox flow batteries through continuous and dynamic electrolyte overflow

Abstract The vanadium crossover through the membrane can have a significant impact on capacity of redox flow battery (VFB) over long-term charge–discharge cycling. different ions move unsymmetrically and this leads to build-up in one half-cell with corresponding decrease other. In paper, dynamic model is developed based mechanisms (diffusion, migration electro osmosis) for each four ions, water protons electrolytes. With simple use approach, basic mass transport theory used simulate transfer battery. validated own measurements therefore predict as function time. This analyse performance by applying an overflow from Different constant rates were analysed regard electrolyte stability. It was observed that continuous increases significantly but stability plays essential role using big crossover. Even good performance, complete remixing tanks necessary prevent precipitations. Therefore, determined such way maximised while electrolytes remain stable 200 cycles. Graphic abstract