Imperial College London
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DrMonicaMarinescu

Faculty of Engineering, Department of Mechanical Engineering

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Contact

 

+44 (0)20 7594 7091monica.marinescu Website

 
 
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Location

 

722Mechanical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Marinescu:2016:10.1039/C5CP05755H,
author = {Marinescu, M and Zhang, T and Offer, G},
doi = {10.1039/C5CP05755H},
journal = {Physical Chemistry Chemical Physics},
pages = {584--593},
title = {A zero dimensional model of lithium-sulfur batteries during charge and discharge},
url = {http://dx.doi.org/10.1039/C5CP05755H},
volume = {18},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Lithium-sulfur cells present an attractive alternative to Li-ion batteries due to their large energy density, safety, and possible low cost. Their successful commercialisation is dependent on improving their performance, but also on acquiring sufficient understanding of the underlying mechanisms to allow for the development of predictive models for operational cells. To address the latter, we present a zero dimensional model that predicts many observed features in the behaviour of a lithium-sulfur cell during charge and discharge. The model accounts for two electrochemical reactions via the Nernst formulation, power limitations through Butler-Volmer kinetics, and precipitation/dissolution of one species, including nucleation. It is shown that the precipitation/dissolution causes the flat shape of the low voltage plateau, typical of the lithium-sulfur cell discharge. During charge, it is predicted that the dissolution can act as a bottleneck, as for large enough currents smaller amounts dissolve. This results in reduced charge capacity and an earlier onset of the high plateau reaction, such that the two plateaus merge. By including these effects, the model improves on the existing zero dimensional models, while requiring considerably fewer input parameters and computational resources. The model also predicts that, due to precipitation, the customary way of experimentally measuring the open circuit voltage from a low rate discharge might not be suitable for lithium-sulfur. This model can provide the basis for mechanistic studies, identification of dominant effects in a real cell, predictions of operational behaviour under realistic loads, and control algorithms for applications.
AU  - Marinescu,M
AU  - Zhang,T
AU  - Offer,G
DO  - 10.1039/C5CP05755H
EP  - 593
PY  - 2016///
SN  - 1463-9076
SP  - 584
TI  - A zero dimensional model of lithium-sulfur batteries during charge and discharge
T2  - Physical Chemistry Chemical Physics
UR  - http://dx.doi.org/10.1039/C5CP05755H
UR  - https://pubs.rsc.org/en/content/articlelanding/2016/CP/C5CP05755H
UR  - http://hdl.handle.net/10044/1/27658
VL  - 18
ER  -
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