Force-field parameters for vanadium ions (+ 2, + 3, + 4, + 5) to investigate their interactions within the vanadium redox flow battery electrolyte solution

The double-layer membrane consisting of sulfonated poly(ether sulfone) (SPES) sub-layer and polyvinyl alcohol (PVA) sub-layer (denoted as SPES/PVA membrane) was prepared and employed as the separator for vanadium redox flow battery (VRB) system to evaluate the vanadium ions permeability and cell performance. The SPES/PVA membrane is a double-layer structure and exhibits dramatically lower vanadium ions permeability and better cell performance compared to the pristine SPES membrane, PVA membrane, and Nafion117 membrane. The vanadium ion permeability of SPES/PVA membrane is one order of magnitude lower than that of Nafion117 membrane. In further work, the single cell with SPES/PVA membrane showed significantly lower capacity loss, higher coulombic efficiency (>92.5%), and higher energy efficiency (>83.9%) than Nafion117 membrane. In the self-discharge test, SPES/PVA membrane showed 1.8 times longer duration in the open circuit decay than Nafion117 membrane. With all the good properties and low cost, this new kind of double-layer membrane is suggested to have excellent commercial prospects as an ion exchange membrane for VRB systems.

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The Influence of Free Acid in Vanadium Redox‐Flow Battery Electrolyte on “Power Drop” Effect and Thermally Induced Degradation

Energy Technology ◽

10.1002/ente.202000445 ◽

2020 ◽

Vol 8 (10) ◽

pp. 2000445

Author(s):

Nataliya V. Roznyatovskaya ◽

Matthias Fühl ◽

Vitaly A. Roznyatovsky ◽

Jens Noack ◽

Peter Fischer ◽

...

Keyword(s):

Free Acid ◽

Vanadium Redox Flow Battery ◽

Redox Flow Battery ◽

Flow Battery ◽

Thermally Induced ◽

Battery Electrolyte ◽

Vanadium Redox

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Vanadium Redox-Flow-Battery Electrolyte Preparation with Reducing Agents

ECS Meeting Abstracts ◽

10.1149/ma2013-01/9/491 ◽

2013 ◽

Keyword(s):

Reducing Agents ◽

Vanadium Redox Flow Battery ◽

Redox Flow Battery ◽

Flow Battery ◽

Battery Electrolyte ◽

Vanadium Redox

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Investigation of electrolytes of the vanadium redox flow battery (VII): Prediction of the viscosity of mixed electrolyte solution (VOSO4 + H2SO4 + H2O) based on Eyring’s theory

The Journal of Chemical Thermodynamics ◽

10.1016/j.jct.2019.02.020 ◽

2019 ◽

Vol 134 ◽

pp. 69-75 ◽

Cited By ~ 5

Author(s):

Xiangrong Li ◽

Chenglin Jiang ◽

Ye Qin ◽

Jianguo Liu ◽

Jiazhen Yang ◽

...

Keyword(s):

Electrolyte Solution ◽

Vanadium Redox Flow Battery ◽

Redox Flow Battery ◽

Flow Battery ◽

Mixed Electrolyte ◽

Vanadium Redox ◽

Mixed Electrolyte Solution ◽

Eyring's Theory

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Effect of Fe(III) on the positive electrolyte for vanadium redox flow battery

Royal Society Open Science ◽

10.1098/rsos.181309 ◽

2019 ◽

Vol 6 (1) ◽

pp. 181309 ◽

Cited By ~ 4

Author(s):

Muqing Ding ◽

Tao Liu ◽

Yimin Zhang ◽

Zhenlei Cai ◽

Yadong Yang ◽

...

Keyword(s):

Thermal Stability ◽

Electrochemical Behaviour ◽

Vanadium Redox Flow Battery ◽

Collision Probability ◽

Redox Flow Battery ◽

Flow Battery ◽

Transfer Resistance ◽

Practical Guidance ◽

Vanadium Redox ◽

Vanadium Ions

It is important to study the effect of Fe(III) on the positive electrolyte, in order to provide some practical guidance for the preparation and use of vanadium electrolyte. The effect of Fe(III) on the thermal stability and electrochemical behaviour of the positive electrolyte for the vanadium redox flow battery (VRFB) was investigated. When the Fe(III) concentration was above 0.0196 mol l −1 , the thermal stability of V(V) electrolyte was impaired, the diffusion coefficient of V(IV) species decreased from (2.06–3.33) × 10 −6 cm 2 s −1 to (1.78–2.88) × 10 −6 cm 2 s −1 , and the positive electrolyte exhibited a higher electrolyte resistance and a charge transfer resistance. Furthermore, Fe(III) could result in the side reaction and capacity fading, which would have a detrimental effect on battery application. With the increase of Fe(III), the collision probability of vanadium ions with Fe(III) and the competition with the redox reaction was aggravated, which would interfere with the electrode reaction, the diffusion of vanadium ions and the performance of VRFB. Therefore, this study provides some practical guidance that it is best to bring the impurity of Fe(III) below 0.0196 mol l −1 during the preparation and use of vanadium electrolyte.

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