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Importance of in-situ techniques in the investigation of rechargeable lithium-sulfur batteries

Cañas, Natalia Andrea and Wagner, Norbert and Friedrich, K. Andreas (2013) Importance of in-situ techniques in the investigation of rechargeable lithium-sulfur batteries. Batteries 2nd Workshop on Lithium sulfur batteries, 6.-7. Nov. 2013, Dresden, Deutschland.

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Abstract

The lithium-sulfur (Li-S) battery promises with its high theoretical capacity (1675 mA h-1) and energy density (2600 Wh kg-1) to be one of the energy storage systems of the future. However, the electrochemical processes and degradation mechanisms of the cells need further investigation to improve their capacity and safety. In this work, in-situ characterization methods were applied for the characterization of reaction products and changes in the electrode properties. By means of XRD, the formation of reaction products during charge and discharge were monitored in operando [1]. The formation of dilithium sulfide and the recrystallization of sulfur were semi-quantitatively determined. The electrochemical behavior of the cell was also investigated using electrochemical impedance spectroscopy (EIS) at different depths of discharge and charge; and up to 50 cycles [2]. An electrical circuit is proposed to quantify the impedance contribution of the cell. Changes in the electrolyte resistance and charge transfer resistance due layer formation on the electrode are amongst others the analyzed processes in this research. Furthermore, atomic force microscopy (AFM) measurements provide information about changes in the electrical conductivity of the cathode surface. UV-spectroscopy is presented as a significant technique for analyzing the polysulfides intermediates products. This work highlights the importance of in-situ studies and the combination of different spectroscopic and microscopic techniques to reveal new insights into the Li-S battery.

Item URL in elib:https://elib.dlr.de/86046/
Document Type:Conference or Workshop Item (Speech)
Title:Importance of in-situ techniques in the investigation of rechargeable lithium-sulfur batteries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cañas, Natalia Andreanatalia.canas (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:6 November 2013
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:X-ray diffraction in-situ techniques lithium sulfur batteries
Event Title:Batteries 2nd Workshop on Lithium sulfur batteries
Event Location:Dresden, Deutschland
Event Type:Workshop
Event Dates:6.-7. Nov. 2013
Organizer:Fraunhofer IWS
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 - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Cañas, Natalia Andrea
Deposited On:16 Dec 2013 14:25
Last Modified:31 Jul 2019 19:43

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