Mass Transfer Characteristic Analysis and Optimization of Flow Field for Neutral Organic Redox Flow Battery Based on 1‐DPAQCl

Abstract

A novel negative electrolyte for organic redox flow battery has been synthesized, which has higher solubility in neutral solution. In order to promote the commercialization of the novel electrolyte(1-DPAQCl), a series of optimization should be carried out, in which the first is the operating conditions and mass transfer. A 3D steady state finite element model was established, which was compared with a lot of experimental data. The effects of only increasing the positive concentrations and only increasing the negative concentrations on the battery behaviors have been analyzed and the results showed that the setting of only increasing the positive concentrations can improve the discharge voltage up to 1.8 % and decrease the charging voltage by 1.21 %. The battery performances under four flow fields were investigated based on this model and the concentration uniformity factor of the four flow design were obtained. The results presented that the charge-discharge voltages of the interdigital flow field (IFF) was the best, which was followed by the rotary flow field (RFF) and serpentine flow field (SFF), the parallel flow field (PFF) was worst. The uniformity factors of IFF were 23.5 % higher than that of PFF and 12.5 % higher than that of SFF.