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Modeling of adsorption processes at nanostructured cathodes in lithium-sulfur batteries

Lück, Jessica and Latz, Arnulf (2016) Modeling of adsorption processes at nanostructured cathodes in lithium-sulfur batteries. Bunsentagung 2016, 5.-7. Mai 2016, Rostock, Deutschland.

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Abstract

Due to its high theoretical energy density lithium-sulfur batteries are one of the most promising candidates for future energy storage. This position is further based on low costs, an intrinsic overload protection, non-toxicity and the natural abundance of its compounds [1]. Nevertheless even after 5 decades of research lithium-sulfur cells are still far away from a commercialization. All occurring challenges in the operation of lithium-sulfur batteries are associated with intermediate species, which are produced when lithium reacts with sulfur [2]. These lithium polysufides differ in their chain length and their solubility. Soluble polysulfides generate a redox shuttle between cathode and anode, while insoluble polysulfides precipitate on the anode. This leads to a reduction of active sulfur and to a corrosion and polarization of the anode. One strategy to overcome this is a structuring of the cathode to retain soluble lithium polysulfides [3]. We present a thermodynamically consistent continuum model for nanostructured sulfur carbon composite cathodes. All polysulfides are assumed to be contained in carbon particles. Particular emphasis is put to the adsorption of Li ions on the carbon surface and covers the influence of the electrochemical double-layer. The surface effects are modeled from electrostatic considerations only, without assuming structural properties of the double-layer. Therefore, the model allows us insight into the chemical and physical processes at the electrode-electrolyte interface as well as their influence on the operation of a Li-S battery. [1] L.F. Nazar et al., J. Mater. Chem., 20, 9821-9826, (2010). [2] S.S. Zhang, J. Power Sources 231, 153-162, (2013). [3] G. Zheng, Nano Lett. 11, 4462-4467, (2011).

Item URL in elib:https://elib.dlr.de/108999/
Document Type:Conference or Workshop Item (Speech)
Title:Modeling of adsorption processes at nanostructured cathodes in lithium-sulfur batteries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lück, JessicaJessica.Lueck (at) dlr.deUNSPECIFIED
Latz, Arnulfarnulf.latz (at) dlr.deUNSPECIFIED
Date:May 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Double-Layer Lithium-Sulfur
Event Title:Bunsentagung 2016
Event Location:Rostock, Deutschland
Event Type:international Conference
Event Dates:5.-7. Mai 2016
Organizer:Deutsche Bunsen-Gesellschaft für physikalische Chemie
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Batteries) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Lück, Jessica
Deposited On:06 Dec 2016 11:22
Last Modified:31 Jul 2019 20:06

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