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3.3.3 Electrode Compression In flow batteries, the porous felt electrodes tend to contribute to large ohmic losses. In a recent study, it has been documented that compressing the electrodes can decrease these losses by as much as a factor of three [2]. In order to test this effect, the standard gaskets were replaced with thicker gaskets which provided a compression of only 0.6% instead of the standard 26%. The difference in performance was minimal and is shown in Figures 3.9 and 3.10. Interestingly, the less compressed configuration exhibited less nonlinearity in high discharge losses. These results were verified over several trials but only two compression levels were evaluated. A possible explanation for this behavior is that, in addition to lowering resistance, excessive compression closed many pores in the electrode, thereby decreasing the effective surface area and increasing flow around the edges of the electrode. If true, this would result in a higher mass flow rate per unit area and a decrease in mass transport losses. This response is reflected in the data. Figure 3.9: Electrode compression effect on polarization (E0 = 1.41 V). 20PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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