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Fabrication of sulfur cathodes by wet-powder spraying and the understanding of degradation

Cañas, Natalia A. and Baltazar, Ana and Morais, Micael Ângelo and Freitag, Thomas Oliver and Wagner, Norbert and Friedrich, K. Andreas (2015) Fabrication of sulfur cathodes by wet-powder spraying and the understanding of degradation. Electrochimica Acta, 157, pp. 351-358. Elsevier. DOI: [10.1016/j.electacta.2015.01.002] ISSN 0013-4686

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Official URL: http://www.elsevier.com/locate/electacta

Abstract

In this work, wet powder spraying is presented as an alternative method for the fabrication of sulfur/carbon composite cathodes. The high dispersion and homogeneity of the cathode layer result in high capacity Li/S batteries. Additional use of LiNO3 as additive improved the discharge capacity to 800 Ah kgS, 400 Ah kgcathode (at 0.18 C) and 410 Ah kgS, 205 Ah kgcathode (at 2 C) after 50 cycles. The shuttle mechanism is reduced and a coulombic efficiency of around 100% is reached and maintained constant until 1000 cycles. To understand more the degradation mechanisms of the battery, Thermogravimetry combined with gas analysis (TG/MS) as well X-ray diffraction (operando and mappings) were applied. The formation of an amorphous phase during cycling that remains nearly stable in the later cycles is considered to be one of the main factors affecting capacity decay. Moreover, others processes are identified as contributors of battery degradation like PVDF decomposition, structural changes of carbon black, and reduction of sulfur content on the bulk of the electrode. These new insights on the degradation processes may contribute to the further understanding, selection of materials, and improvement of this battery.

Item URL in elib:https://elib.dlr.de/99192/
Document Type:Article
Title:Fabrication of sulfur cathodes by wet-powder spraying and the understanding of degradation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cañas, Natalia A.natalia.canas (at) dlr.deUNSPECIFIED
Baltazar, AnaDLRUNSPECIFIED
Morais, Micael ÂngeloDLRUNSPECIFIED
Freitag, Thomas OliverThomas.Freitag (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Electrochimica Acta
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:157
DOI :[10.1016/j.electacta.2015.01.002]
Page Range:pp. 351-358
Publisher:Elsevier
ISSN:0013-4686
Status:Published
Keywords:Lithium sulfur batteries spraying degradation
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: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:15 Dec 2015 11:44
Last Modified:06 Sep 2019 15:16

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