| This thesis mainly reports two kinds of noval single liquid flow battery:one is single flow acid Cd-PbO2 battery; the other is single flow acid Zn-PbO2 battery.The single flow acid Cd-PbO2 battery was firstly studied, in which the electrodeposited cadmium was employed as negative electrode, lead dioxide as positive electrode and the intermixture of H2SO4-CdSO4-DPE-3 as electrolyte. The experimental results show that the surface morphology of the deposited cadmium is smooth and no cadmium dendrite forms on the surface of the copper substrate in the electrolyte of 2 M sulfuric acid,1 M cadmium sulfate and 0.3 g dm-3 DPE-3 additive at current density of both 10 and 20 mA cm-2. The results also demonstrate that the single flow acid battery with a rated capacity of 900 mA h can offer a discharge voltage of 2.05 V, an high coulombic efficiency of 98.1% and an energy efficiency of 88.4% during 300 cycles at a charge/discharge current density of 10 mA cm-2.The single flow acid Zn-PbO2 battery employed sedimentary zinc as negative electrode, lead dioxide as positive electrode and the intermixture of H2SO4-ZnSO4 as electrolyte. The influence of additives (Bi3+, DPE-3, In3+, Sn2+) and current density on the capacity efficiency of zinc electrode were studied by FSEM and constant-current charging and discharging test. The experimental results show that the highest capacity and energy efficency can be obtained in the electrolyte of 1.5 M sulfuric acid,1 M zinc sulfate and 1.35 g dm-3 DPE-3 additive at 20-40 mA cm-2. The results also demonstrate that the single flow acid battery with a rated capacity of 400 mA h can offer a discharge voltage of 2.3 V, an average coulombic efficiency of 94% and an energy efficiency of 75% during 350 cycles at a charge/discharge current density of 20 mA cm-2. |
PDF Full Text Request