Degradation of Li/S battery electrodes on 3D current collectors studied using X-ray phase contrast tomography

Abstract: Lithium/sulphur batteries are promising candidates for future energy storage systems, mainly due to their high potential capacity. However low sulphur utilization and capacity fading hinder practical realizations. In order to improve understanding of the system, we investigate Li/S electrode morphology changes for different ageing steps, using X-ray phase contrast tomography. Thereby we find a strong decrease of sulphur loading after the first cycle, and a constant loading of about 15% of the initial loading afterwards. While cycling, the mean sulphur particle diameters decrease in a qualitatively similar fashion as the discharge capacity fades. The particles spread, migrate into the current collector and accumulate in the upper part again. Simultaneously sulphur particles lose contact area with the conducting network but regain it after ten cycles because their decreasing size results in higher surface areas. Since the capacity still decreases, this regain could be associated with effects such as surface area passivation and increasing charge transfer resistance

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch
Anmerkungen
Scientific Reports. 5 (2014), 10921. DOI: 10.1038/srep10921, issn: 2045-2322
IN COPYRIGHT http://rightsstatements.org/page/InC/1.0 rs

Klassifikation
Biowissenschaften, Biologie
Schlagwort
Tomografie
Lithium-Ionen-Akkumulator

Ereignis
Veröffentlichung
(wo)
Freiburg
(wer)
Universität
(wann)
2014
Urheber
Beteiligte Personen und Organisationen
Zengerle, Roland
Thiele, Simon
Albert-Ludwigs-Universität Freiburg
Technische Fakultät

DOI
10.1038/srep10921
URN
urn:nbn:de:bsz:25-freidok-122210
Rechteinformation
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Letzte Aktualisierung
25.03.2025, 13:54 MEZ

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Entstanden

  • 2014

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