Insights into the solvation of vanadium ions in the vanadium redox flow battery electrolyte using molecular dynamics and metadynamics

2018 ◽  
Vol 270 ◽  
pp. 471-479 ◽  
Author(s):  
Sukriti Gupta ◽  
Tuti M. Lim ◽  
Samir H. Mushrif
Keyword(s):  
Molecular Dynamics ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Battery Electrolyte ◽  
Vanadium Redox ◽  
Vanadium Ions

Preparation and characterization of SPES/PVA (double-layer) membrane for vanadium redox flow battery

2018 ◽  
Vol 31 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Jili Xie ◽  
Guanlin Li ◽  
Wang Tan
Keyword(s):  
Double Layer ◽  
Layer Structure ◽  
Coulombic Efficiency ◽  
Cell Performance ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Layer Membrane ◽  
Vanadium Redox ◽  
Vanadium Ions

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.

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

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

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

2019 ◽  
Vol 6 (1) ◽  
pp. 181309 ◽  
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.

Towards an all-vanadium redox-flow battery electrolyte: electrooxidation of V(III) in V(IV)/V(III) redox couple

2016 ◽  
Vol 211 ◽  
pp. 926-932 ◽  
Author(s):  
Nataliya Roznyatovskaya ◽  
Jens Noack ◽  
Matthias Fühl ◽  
Karsten Pinkwart ◽  
Jens Tübke
Keyword(s):  
Redox Couple ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Battery Electrolyte ◽  
Vanadium Redox
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