화학공학소재연구정보센터
Journal of Power Sources, Vol.360, 548-558, 2017
Effect of electrode intrusion on pressure drop and electrochemical performance of an all-vanadium redox flow battery
In this paper, we present a study of the effect of electrode intrusion into the flow channel in an all vanadium redox flow battery. Permeability, pressure drop and electrochemical performance have been measured in a cell with active area 100 cm(2) and 414 cm(2) fitted with a carbon felt electrode of thickness of 3, 6 or 9 mm compressed to 1.5, 2.5 or 4 mm, respectively, during assembly. Results show that the pressure drop is significantly higher than what can be expected in the thick electrode case while its electrochemical performance is lower. Detailed flow analysis using computational fluid dynamics simulations in two different flow fields shows that both these results can be attributed to electiode intrusion into the flow channel leading to increased resistance to electrolyte flow through the electrode. A correlation is proposed to evaluate electrode intrusion depth as a function of compression. (C) 2017 Elsevier B.V. All rights reserved.