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Study on Anode Electrolyte Stability and Battery Performance of Vanadium Redox Flow Battery

Author: LiuNa
Tutor: GuoXingPeng
School: Huazhong University of Science and Technology
Course: Applied Chemistry
Keywords: Vanadium redox flow battery Anolyte Additive Stability Battery performance
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 123
Quote: 0
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Abstract


Vanadium redox flow battery its characteristics of safety , environmental protection , energy storage field attracted widespread attention , but anolyte vanadium ion concentration in more than 2moL / L , due to over- saturation , high temperatures will cause V (Ⅴ) Shen analysis . Increasing the concentration of sulfuric acid can increase the solubility of V (Ⅴ) , but will reduce the solubility of V (Ⅳ) , and increases the concentration of sulfuric acid , corrosive electrolyte is bound to increase , it is necessary to find a suitable stabilizer to improve the anolyte stability. In this thesis, using oxalic acid reduction method vanadium redox flow battery anolyte to evaluate the effect of different additives to improve sodium hydrogen sulfate , potassium sulfate , potassium bisulfate and acetic acid electrolyte stability , explore different additives to improve electrolyte stability Mechanism . The results show that addition of 1% sodium hydrogen sulfate , potassium hydrogen sulfate and acetic acid , the anolyte stability superior to add 1% of potassium persulfate anolyte . Cyclic voltammetry and UV spectrum test results show that the additive will not adversely affect the electrochemical properties of the electrolyte . Seen from the AC impedance spectra data , adding additives , can improve the conductivity of the electrolyte solution . To study electrolyte additive for battery performance , by optimizing reservoir design , assembly of a the single vanadium redox flow battery of the laboratory level . Reservoir seal in the form of the new design to solve the low valence vanadium ions caused by oxidation of the battery positive and negative charge inconsistent state and due to the pressure imbalance ion penetration , water infiltration and diaphragm aging problem , extended the service life of the diaphragm , to improve the the Coulomb efficiency and service life of the flow battery . Evaluate the processing temperature and the time of the graphite felt electrodes , charge and discharge current density, the influence of the number of cycles of the battery performance preliminarily discussed affect battery performance reasons . The results show that the graphite felt 600 ℃ after 4h , the highest activity, the smallest battery resistance ; current efficiency is reduced with the increase of the charging current of current density , voltage efficiency with the charge / discharge current density and reduce ; charge and discharge processes in the pre the battery current efficiency increases with increasing number of cycles ; adding additives had no effect on the internal resistance of the battery and the charge-discharge performance .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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