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

Roznyatovskaya Nataliya V. | Zendy; Fühl Matthias | Zendy; Roznyatovsky Vitaly A. | Zendy; Noack Jens | Zendy; Fischer Peter | Zendy; Pinkwart Karsten | Zendy; Tübke Jens | Zendy

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

Author(s) -

Roznyatovskaya Nataliya V.,

Fühl Matthias,

Roznyatovsky Vitaly A.,

Noack Jens,

Fischer Peter,

Pinkwart Karsten,

Tübke Jens

Publication year - 2020

Publication title -

energy technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.91

H-Index - 44

eISSN - 2194-4296

pISSN - 2194-4288

DOI - 10.1002/ente.202000445

Subject(s) - vanadium , flow battery , electrolyte , chemistry , inorganic chemistry , drop (telecommunication) , sulfate , redox , sulfuric acid , analytical chemistry (journal) , electrode , chromatography , organic chemistry , telecommunications , computer science

A series of vanadium redox‐flow battery (VRFB) electrolytes at 1.55 m vanadium and 4.5 m total sulfate concentration are prepared from vanadyl sulfate solution and tested under conditions of appearance of “power drop” effect (discharge at high current density from high state‐of‐charge). A correlation between the initial electrolyte composition, the thermal stability of catholyte, and the susceptibility of VRFB to exhibit a “power drop” effect is derived. The increase in total acidity to 3 m , expressed as concentration of sulfuric acid in precursor vanadyl sulfate solution, enables “power drop”‐free operation of VRFB at least at 75 mA cm −2 . Thermally‐induced degradation of electrolyte is evaluated based on decrease in vanadium concentration in the electrolyte series after exposure to the temperature of 45 °C and based on characterization of catholytes series using 51 V, 17 O, and 1 H nuclear magnetic resonance spectroscopy.

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