Oboroceanu, D,Quill, N,Lenihan, C,Eidhin, DN,Albu, SP,Lynch, RP,Buckley, DN

2017

November

Mrs Advances

Measurements of V-V Precipitation Times and Simulation of the Stability of Catholytes in Vanadium Flow Batteries

Published

()

HIGH-ENERGY DENSITY ELECTRODE-KINETICS CARBON STORAGE

2

1177

1182

The stability of vanadium flow battery (VFB) catholytes was investigated using both light-scattering measurements and visual observation. V2O5 precipitates after an induction time tau which shows an Arrhenius variation with temperature. The value of tau increases with increasing concentration of sulfate and with decreasing concentration of V-V but the activation energy remains constant with a value of (1.791 +/- 0.020) eV. Plots of ln tau against [S] and [V-V] show good linearity and the slopes give values of beta(S) = 2.073 M-1 and beta(V5) = -3.434 M-1 for the fractional rates of variation of tau with [S] and [V-V], respectively. Combining the Arrhenius Equation with the observed log-linear variation of tau with [S] and [V-V] provides a model for simulating the stability of catholytes.

10.1557/adv.2017.84