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B.2 Copper Corrosion On each side of the cell, the electrodes make external connections via the copper current collectors. Even while the cell is in the open-circuit configuration, these plates maintain the voltages of their respective electrolytes. Over a period of days, corrosion developed on the current collectors. This corrosion had to be cleaned off during cell disassembly to prevent high surface resistance upon reassembly. A solution was to create a short circuit across the cell terminals during storage. This consumed any remaining charge in the cell and substantially slowed oxidation of the copper. Figure B.2: Copper Corrosion. B.3 Cable Resistance During early charge/discharge testing, the cell was connected to a power supply via standard alligator cables and the terminal voltage was assumed to be equal to the power supply output voltage. However, it was discovered that because the cell’s internal resistance was less than one Ohm, a substantial voltage drop was occurring across the cables connecting the cell to the power supply. Thus, the cell’s terminal voltage was not equal to the power supply’s output voltage. This mistake was corrected by measuring voltage at the cell’s terminals via a 4-wire measurement. With this mistake rectified, greater currents through the cell were achieved and charging time was reduced from several hours to about 1 hour. 32PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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