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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zielke L,Barchasz C,Waluś S,Alloin F,Leprêtre JC,Spettl A,Schmidt V,Hilger A,Manke I,Banhart J,Zengerle R,Thiele Sdoi
10.1038/srep10921subject
Has Abstractpub_date
2015-06-04 00:00:00pages
10921issn
2045-2322pii
srep10921journal_volume
5pub_type
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