Real-Time Monitoring of the Thermal Effect for the Redox Flow Battery by an Infrared Thermal Imaging Technology

Abstract

In this study, a new monitoring method was developed, titled infrared thermal imaging technology, which can effectively evaluate the thermal effect of the charge-discharge test in the vanadium/iodine redox flow battery (V/I RFB). The results show that the all-vanadium redox flow battery (all-V RFB) has a greater molar reaction Gibbs free energy change than that of the V/I RFB, representing a large thermal effect of the all-V RFB than the V/I RFB. The charge-discharge parameters, flow rate and current density, are important factors for inducing the thermal effect, because of the concentration polarization and the ohmic resistor. The new membrane (HS-SO3H) shows a high ion exchange capacity and a good ions crossover inhibitory for the V/I RFB system, and has a high coulomb efficiency that reaches 96%. The voltage efficiency was enhanced from 61% to 86% using the C-TiO2-Pd composite electrode as a cathode with the serpentine-type flow field for the V/I RFB. By adopting the high-resolution images of an infrared thermal imaging technology with the function of the temperature profile data, it is useful to evaluate the key components’ performance of the V/I RFB, and is a favorable candidate in the developing of the redox flow battery system.

Improved solubility of titanium-doped polyoxovanadate charge carriers for symmetric non-aqueous redox flow batteries

“…RFBs generate heat when consuming electric power in their working state. 56 As such, activation, ohmic and concentration losses can manifest during battery cycling as the reaction kinetics and transport properties of the electrolyte are functions of temperature. 57,58 These losses can affect the battery performance metrics (such as state-of-charge, SOC) and can also result in the degradation of the active material.…”

Potassium supporting electrolyte enhances stability of Ti-substituted polyoxovanadates for nonaqueous redox flow batteries

“…RFBs dissipate energy in the form of heat when consuming electric power in their working state. 43 This intrinsic attribute can produce activation, ohmic, and concentration losses during battery cycling as the reaction kinetics and transport properties of the electrolyte are functions of temperature. 44,45 These losses can result in the degradation of the active material that can further affect the battery performance metrics.…”