Tri-sulfur radical trapping in lithium–sulfur batteries
Artikel i vetenskaplig tidskrift, 2024

Lithium-sulfur (Li–S) batteries have emerged as a next-generation battery technology owing to their prospects of high capacity and energy density. They, however, suffer from rapid capacity decay due to the shuttling of reaction intermediate species: Li polysulfides (LiPSs). One of the more important and intriguing PSs is the tri-sulfur radical (S3•−), observed mainly in high-donor number (DN) solvent-based electrolytes. Although this radical has been proposed to be crucial to full active material (AM) utilization, there is currently no direct evidence of the impact of S3•− on cycling stability. To gain more insight into the role of the S3•−, we studied the use of radical traps in low and high DN solvent-based electrolytes by operando Raman spectroscopy. The traps were based on nitrone and iminium cation, and S3•− was indeed successfully trapped in ex situ analysis. However, it was the ionic liquid-based trap, specifically pyridinium, that effectively suppressed S3•− during battery operation. Overall, the PS formation was altered in the presence of the traps and we confirmed the impact of S3•− formation on the Li–S battery redox reactions and show how the trapping correlates with Li–S battery performance. Therefore, stabilization of the S3•− might be a path to improved Li–S batteries.

Li-S batteries

Tri-sulfur radical

Radical trap

Cycling stability


Roza Bouchal

Chalmers, Fysik, Materialfysik

Clément Pechberty

Chalmers, Fysik, Materialfysik

Athmane Boulaoued

Chalmers, Fysik, Materialfysik

Niklas Lindahl

Göteborgs universitet

Institutionen för fysik, GU

Patrik Johansson

Centre national de la recherche scientifique (CNRS)

Chalmers, Fysik, Materialfysik

Journal of Power Sources Advances

26662485 (eISSN)

Vol. 28 100153

High energy lithium sulphur cells and batteries (HELIS)

Europeiska kommissionen (EU) (EC/H2020/666221), 2015-06-01 -- 2019-05-31.


Oorganisk kemi


Annan kemiteknik



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