Monitoring the State of Charge of Operating Vanadium Redox Flow Batteries

2019 ◽  
Vol 41 (23) ◽  
pp. 1-9 ◽  
Author(s):  
Zhijiang Tang ◽  
Douglas S. Aaron ◽  
Alexander B. Papandrew ◽  
Thomas A. Zawodzinski
Keyword(s):  
The State ◽  
State Of Charge ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

In Situ X-ray Near-Edge Absorption Spectroscopy Investigation of the State of Charge of All-Vanadium Redox Flow Batteries

2014 ◽  
Vol 6 (20) ◽  
pp. 17920-17925 ◽  
Author(s):  
Chuankun Jia ◽  
Qi Liu ◽  
Cheng-Jun Sun ◽  
Fan Yang ◽  
Yang Ren ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
The State ◽  
State Of Charge ◽  
X Ray ◽  
Edge Absorption ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Photometrical Determination of the State-of-Charge in Vanadium Redox Flow Batteries Part I: In Combination with Potentiometric Titration

2019 ◽  
Vol 233 (12) ◽  
pp. 1683-1694 ◽  
Author(s):  
Jan Geiser ◽  
Harald Natter ◽  
Rolf Hempelmann ◽  
Bernd Morgenstern ◽  
Kaspar Hegetschweiler
Keyword(s):  
Potentiometric Titration ◽  
Nir Spectroscopy ◽  
The State ◽  
State Of Charge ◽  
Vanadium Redox Flow Battery ◽  
Absorption Coefficients ◽  
Vanadium Concentration ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

AbstractThe stepwise oxidation of vanadium ions in electrolytes, as used in all vanadium redox flow batteries (VRFB), is studied offline by a combination of potentiometric titration and simultaneous UV/Vis/NIR spectroscopy. Eight different total vanadium concentrations between 0.2 mol L−1 and 1.6 mol L−1 have been investigated. The analyte (titrand, V2+ solution) is the anolyte (V2+/V3+ side) of a fully charged laboratory vanadium redox flow battery (VRFB). Absorption maxima are observed at λ = 850 nm for V2+ and at λ = 400 nm for V3+, the corresponding absorption coefficients are determined. In the former case an extrapolation procedure is necessary because during transfer from the VRFB to the titration cell, oxidation to V3+ by ambient oxygen cannot completely be avoided. Based on the knowledge of the absorption coefficients, via simultaneous photometry of V2+ and V3+, the state-of-charge of the anolyte of a VRFB can be determined. In the catholyte (V4+/V5+ side) of a VRFB the formation of an intermediate mixed valence VIV–VV complex at large vanadium concentration prevents a simple photometric SOC determination.

Real-time monitoring of the state of charge (SOC) in vanadium redox-flow batteries using UV–Vis spectroscopy in operando mode

2020 ◽  
Vol 27 ◽  
pp. 101066 ◽  
Author(s):  
Kyung-Hee Shin ◽  
Chang-Soo Jin ◽  
Jae-Young So ◽  
Se-Kook Park ◽  
Dong-Ha Kim ◽  
...  
Keyword(s):  
Real Time ◽  
The State ◽  
State Of Charge ◽  
Real Time Monitoring ◽  
Redox Flow Batteries ◽  
Vis Spectroscopy ◽  
Flow Batteries ◽  
In Operando ◽  
Vanadium Redox

Monitoring the State-of-Charge in All-Iron Aqueous Redox Flow Batteries

2018 ◽  
Vol 165 (13) ◽  
pp. A3164-A3168 ◽  
Author(s):  
Noemí Aguiló-Aguayo ◽  
Thomas Bechtold
Keyword(s):  
The State ◽  
State Of Charge ◽  
Redox Flow Batteries ◽  
Flow Batteries

scholarly journals Online Spectroscopic Study on the Positive and the Negative Electrolytes in Vanadium Redox Flow Batteries

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Le Liu ◽  
Jingyu Xi ◽  
Zenghua Wu ◽  
Wenguang Zhang ◽  
Haipeng Zhou ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Spectroscopic Analysis ◽  
State Of Charge ◽  
Online Detection ◽  
High Concentration ◽  
Chemical Reagents ◽  
Redox Flow Batteries ◽  
Capacity Loss ◽  
Flow Batteries ◽  
Vanadium Redox

Traditional spectroscopic analysis based on the Beer-Lambert law cannot analyze the analyte with high concentration and interference between different compositions, such as the electrolyte in vanadium redox flow batteries (VRBs). Here we propose a new method for online detection of such analytes. We demonstrate experimentally that, by comparing the transmittance spectrum of the analyte with the spectra in a preprepared database using our intensity-corrected correlation coefficient (ICCC) algorithm, parameters such as the state of charge (SOC) of both the positive and the negative electrolytes in the VRB can be online monitored. This method could monitor the level of the electrolytes imbalance in the VRB, which is useful for further rebalancing the electrolyte and restoring the capacity loss of the VRB. The method also has the potential to be used in the online detection of other chemical reactions, in which the chemical reagents have high concentration and interferences between different compositions.

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