Development of the Zinc-Chlorine Battery for Utility

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Development of the Zinc-Chlorine Battery for Utility ( development-zinc-chlorine-battery-utility )

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Charge: Discharge: Chlorine Electrode Area: Electrolyte: pH: Temperature: Flow rate: Cl^ concentration: Table 32-1 STANDARD OPERATING CONDITIONS 2 4 hours at 30mA/cm a) One step discharge: to 0 volts at 30mA/cm 2 b) Three step discharge: 2 1st step: 30mA/cm until AV,. , drschg 2nd step: 20mA/cm until Av . , = 60mV = HOmV 2 2 3rd step: 10mA/cm until 4" electrode: 260cm 6" electrode: 390cm^ 8" electrode: 520cm^ drschg Before charge: 2M ZnCl2 (SpG = 1.21) After charge: 1.5M ZnCl (SpG = 1.15-1.16) Total volume of electrolyte: Before charge: 0.20 ± 0.02 30°C ± 0.5°C 2 2ml/cm /min Charge: 2.4- 2.5g/l Discharge: 2.1 - 2.2 g/i approximately 1.5£ For the electrode heights of 4", 6", and 8", the voltage-time profiles and the round- trip coulombic efficiencies were measured with various static head heights. A three current step discharge process was employed for examining the static head effects on 2 a 4" electrode. The first step discharge was held at 3OmA/cm . The discharge cur- 2 rent was stepped down to 20mA/cm after reaching a voltage decline of 60mV, and 2 stepped down further to lOmA/cm while reaching a voltage decline of HOmV. The cut-off voltage for the third step was set at zero volt. The discharge capacity (amp-min) was monitored using a digital coulometer and recorded at each step. Cell probe voltages were measured with a digital voltmeter and recorded on a strip chart recorder. 32-5 ^=0 dischg

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