Imperial College London
Alternate

Prof Gregory Offer

Faculty of Engineering, Department of Mechanical Engineering

Professor in Electrochemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7072gregory.offer Website

 
 
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Location

 

720City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Walus:2017:10.1016/j.ensm.2017.05.017,
author = {Walus, S and Offer, GJ and Hunt, I and Patel, Y and Stockley, T and Williams, J and Purkayastha, R},
doi = {10.1016/j.ensm.2017.05.017},
journal = {Energy Storage Materials},
pages = {233--245},
title = {Volumetric expansion of Lithium-Sulfur cell during operation – Fundamental insight into applicable characteristics},
url = {http://dx.doi.org/10.1016/j.ensm.2017.05.017},
volume = {10},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - During the operation of a Lithium-Sulfur (Li-S) cell, structural changes take place within both positive and negative electrodes. During discharge, the sulfur cathode expands as solid products (mainly Li2S or Li2S/Li2S2) are precipitated on its surface, whereas metallic Li anode contracts due to Li oxidation/stripping. The opposite processes occur during charge, where Li anode tends to expand due to lithium plating and solid precipitates from the cathode side are removed, causing its thickness to decrease. Most research literature describe these processes as they occur within single electrode cell constructions. Since a large format Li-S pouch cell is composed of multiple layers of electrodes stacked together, and antagonistic effects (i.e. expansion and shrinkage) occur simultaneously during both charge and discharge, it is important to investigate the volumetric changes of a complete cell. Herein, we report for the first time the thickness variation of a Li-S pouch cell prototype. In these studies we used a laser gauge for monitoring the cell thickness variation under operation. The effects of different voltage windows as well as discharge regimes are explored. It was found that the thickness evolution of a complete pouch cell is mostly governed by Li anodes volume changes, which mask the response of the sulfur cathodes. Interesting findings on cell swelling when cycled at slow currents and full voltage windows are presented. A correlation between capacity retention and cell thickness variation is demonstrated, which could be potentially incorporated into Battery Management System (BMS) design for Li-S batteries.
AU  - Walus,S
AU  - Offer,GJ
AU  - Hunt,I
AU  - Patel,Y
AU  - Stockley,T
AU  - Williams,J
AU  - Purkayastha,R
DO  - 10.1016/j.ensm.2017.05.017
EP  - 245
PY  - 2017///
SN  - 2405-8297
SP  - 233
TI  - Volumetric expansion of Lithium-Sulfur cell during operation – Fundamental insight into applicable characteristics
T2  - Energy Storage Materials
UR  - http://dx.doi.org/10.1016/j.ensm.2017.05.017
UR  - http://hdl.handle.net/10044/1/49468
VL  - 10
ER  -
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