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Fabrication and Characterization of Lithium–Sulfur Batteries

Cañas, Natalia A. (2015) Fabrication and Characterization of Lithium–Sulfur Batteries. Dissertation, Universität Stuttgart.

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This work is focused on the characterization of the Li–S battery by application of several characterization techniques under in situ and ex situ conditions. Using X–ray diffraction, the reaction of sulfur was monitored during discharge and charge, and the formation of nano–crystalline lithium sulfide as end product of discharge was identified for the first time in operando. The structural changes of sulfur and its partial amorphization were observed after charge and analyzed using the Rietveld method. Furthermore, electrochemical impedance spectroscopy was applied during cycling to measure the impedance characteristics of the cell. For this, an electrical equivalent circuit was designed to describe specific physical and electrochemical process. Thus, the resistance of the electrolyte, the charge transfer resistance in the electrodes, as well as the reaction and dissolution of isolating products were simulated and quantified. The polysulfides, as well as S8 and Li2S, were investigated in an organic electrolyte using UV–vis spectroscopy. Here, the species S6 2− and S3 •− were identified and semi–quantified at several states of discharge.

Item URL in elib:https://elib.dlr.de/101044/
Document Type:Thesis (Dissertation)
Title:Fabrication and Characterization of Lithium–Sulfur Batteries
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cañas, Natalia A.natalia.canas (at) dlr.deUNSPECIFIED
Date:24 July 2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:189
Keywords:Lithium-Schwefelbatterie In-situ XRD Herstellungsmethoden Elektrochemische Impedanzspektroskopie
Institution:Universität Stuttgart
Department:Institut für Thermodynamik und Wärmetechnik (ITW)
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 > Electrochemical Energy Technology
Deposited By: Wagner, Dr.rer.nat. Norbert
Deposited On:16 Dec 2015 09:41
Last Modified:31 Jul 2019 19:58

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