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Investigations of lithium-sulfur batteries using electrochemical impedance spectroscopy

Canas, Natalia and Hirose, Kei and Wagner, Norbert and Friedrich, K. Andreas (2013) Investigations of lithium-sulfur batteries using electrochemical impedance spectroscopy. 9th International Symposium on Electrochemical Impedance Spectroscopy, 16.-21. Juni, 2013, Okinawa, Japan.

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Abstract

The lithium-sulfur (Li-S) battery is a promising rechargeable system due to its high theoretical capacity (1675 mAh gsulfur-1), energy density (2500 Wh kg-1), low cost and the non-toxicity of sulfur. In order to optimize the performance of the cell, it is highly important to understand the electrochemical and degradation processes of the cell during cycling. In this work, the electrochemical behavior of lithium-sulfur (Li-S) batteries was investigated by means of electrochemical impedance spectroscopy (EIS). Measurements were performed in equidistant charge intervals at different depths of discharge and charge during the first cycle. Additionally, the degradation of the cells was analyzed for up to 50 cycles. An equivalent electrical circuit is proposed to simulate the electrochemical processes and to quantify the impedance contributions of Li-S batteries. EIS as a function of the cycle number shows an increased capacity for fading correlated with a decrease in the charge transfer resistance of the cathode.

Item URL in elib:https://elib.dlr.de/83118/
Document Type:Conference or Workshop Item (Poster)
Title:Investigations of lithium-sulfur batteries using electrochemical impedance spectroscopy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Canas, Natalianatalia.canas (at) dlr.deUNSPECIFIED
Hirose, Keikei.hirose (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:18 June 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Lithium-Schwefelbatterie Impedanzspektroskopie Ersatzschaltbild
Event Title:9th International Symposium on Electrochemical Impedance Spectroscopy
Event Location:Okinawa, Japan
Event Type:international Conference
Event Dates:16.-21. Juni, 2013
Organizer:Universität Waseda, Tokio
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: Wagner, Dr.rer.nat. Norbert
Deposited On:12 Aug 2013 14:36
Last Modified:12 Aug 2013 14:36

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