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Modeling of nano-structured cathodes for improved lithium-sulfur batteries

Danner, Timo and Zhu, Guanchen and Hofmann, Andreas F. and Latz, Arnulf (2015) Modeling of nano-structured cathodes for improved lithium-sulfur batteries. Electrochimica Acta (184), pp. 124-133. Elsevier. DOI: 10.1016/j.electacta.2015.09.143 ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2015.09.143

Abstract

Some of the most remarkable improvements in the cycle life of Li-S batteries could be achieved by nano-structuring of the sulfur/carbon (S/C) cathode material. Meso- and micro-porous particles, carbon nano tubes, and other sophisticated structures are used to actively retain highly soluble polysulfides which are responsible for capacity fading and a short cycle life. In this article we present a detailed 1+1D continuum model of S/C composite cathodes which is based on an ideal structure where all polysulfides are confined within meso- and micro-porous carbon particles. The model allows to correlate particle properties to cell performance and gives interesting insights for cell operation. Most interestingly we identified an additional overpotential caused by a transport of Li ions against a concentration gradient into the particle. Furthermore, the model can be used to find optimal structural and electrolyte properties such as pore volume, sulfur loading, solubility products, and salt concentration.

Item URL in elib:https://elib.dlr.de/99755/
Document Type:Article
Title:Modeling of nano-structured cathodes for improved lithium-sulfur batteries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Danner, Timotimo.danner (at) dlr.deUNSPECIFIED
Zhu, GuanchenUNSPECIFIEDUNSPECIFIED
Hofmann, Andreas F.andreas.hofmann (at) dlr.deUNSPECIFIED
Latz, Arnulfarnulf.latz (at) dlr.deUNSPECIFIED
Date:1 December 2015
Journal or Publication Title:Electrochimica Acta
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.electacta.2015.09.143
Page Range:pp. 124-133
Publisher:Elsevier
ISSN:0013-4686
Status:Published
Keywords:Lithium-sulfur battery; Modeling; Meso/micro-porous carbon; Sulfur encapsulation
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Danner, Timo
Deposited On:03 Dec 2015 10:18
Last Modified:06 Sep 2019 15:16

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