Back to Search
Start Over
Modeling the hydrodynamic and electrochemical efficiency of semi-solid flow batteries
- Source :
-
Electrochimica Acta . May2012, Vol. 69, p301-307. 7p. - Publication Year :
- 2012
-
Abstract
- Abstract: A mathematical model of flow cell operation incorporating hydrodynamic and electrochemical effects in three dimensions is developed. The model and resulting simulations apply to recently demonstrated high energy-density semi-solid flow cells. In particular, state of charge gradients that develop during low flow rate operation and their effects on the spatial non-uniformity of current density within flow cells are quantified. A one-dimensional scaling model is also developed and compared to the full three-dimensional simulation. The models are used to demonstrate the impact of the choice of electrochemical couple on flow cell performance. For semi-solid flow electrodes, which can use solid active materials with a wide variety of voltage–capacity responses, we find that cell efficiency is maximized for electrochemical couples that have a relatively flat voltage vs. capacity curve, operated under slow flow conditions. For example, in flow electrodes limited by macroscopic charge transport, an LiFePO4-based system requires one-third the polarization to reach the same cycling rate as an LiCoO2-based system, all else being equal. Our conclusions are generally applicable to high energy density flow battery systems, in which flow rates can be comparatively low for a given required power. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 69
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 74408883
- Full Text :
- https://doi.org/10.1016/j.electacta.2012.03.006