In situ bulk magnetization measurements reveal the state of charge of redox flow batteries

We report two methods, including NMR spectroscopy and direct magnetic susceptibility measurement, for in situ (strictly online) measurement of the state of charge of redox flow batteries. These methods are...

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

ACS Applied Materials & Interfaces ◽

10.1021/am5046422 ◽

2014 ◽

Vol 6 (20) ◽

pp. 17920-17925 ◽

Cited By ~ 24

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

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

Journal of The Electrochemical Society ◽

10.1149/2.0911813jes ◽

2018 ◽

Vol 165 (13) ◽

pp. A3164-A3168 ◽

Cited By ~ 3

Author(s):

Noemí Aguiló-Aguayo ◽

Thomas Bechtold

Keyword(s):

The State ◽

State Of Charge ◽

Redox Flow Batteries ◽

Flow Batteries

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Monitoring the State of Charge of Operating Vanadium Redox Flow Batteries

ECS Meeting Abstracts ◽

10.1149/ma2011-02/13/682 ◽

2011 ◽

Keyword(s):

The State ◽

State Of Charge ◽

Redox Flow Batteries ◽

Flow Batteries ◽

Vanadium Redox

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A combined in situ monitoring approach for half cell state of charge and state of health of vanadium redox flow batteries

Electrochimica Acta ◽

10.1016/j.electacta.2020.137174 ◽

2020 ◽

Vol 362 ◽

pp. 137174

Author(s):

Thorsten Struckmann ◽

Peter Kuhn ◽

Simon Ressel

Keyword(s):

State Of Charge ◽

In Situ Monitoring ◽

State Of Health ◽

Half Cell ◽

Cell State ◽

Redox Flow Batteries ◽

Flow Batteries ◽

Vanadium Redox

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Monitoring the state of charge of all-vanadium redox flow batteries to identify crossover of electrolyte

Electrochimica Acta ◽

10.1016/j.electacta.2019.135573 ◽

2020 ◽

Vol 336 ◽

pp. 135573 ◽

Cited By ~ 1

Author(s):

T. Haisch ◽

H. Ji ◽

C. Weidlich

Keyword(s):

The State ◽

State Of Charge ◽

Redox Flow Batteries ◽

Flow Batteries ◽

Vanadium Redox

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

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2019-1379 ◽

2019 ◽

Vol 233 (12) ◽

pp. 1683-1694 ◽

Cited By ~ 3

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.

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