In-Situ Raman Spectroscopy of Sulfur Speciation in Lithium-Sulfur Batteries
Rate constants obtained for the appearance and disappearance polysulfide species shows that short chain polysulfides are directly formed from S8 decomposition. The rate constants for S8 reappearance and polysulfide disappearance on charge were likewise similar, suggesting that polysulfide oxidation and reduction is quasi-reversible. The formation of polysulfide mixtures at partial discharge was found to be quite stable. We also examined the effect of CS2 addition on the sulfur reduction mechanism. Electrochemical and Raman results show that CS2 stabilizes the S82-product and inhibits further discharge of the cell
(1) Barchasz, C. et al., Anal. Chem. 2012, 84, 3973.
(2) Cuisinier, M. at al., J. Phys. Chem. Lett. 2013, 4, 3227.
(3) Yeon, J.-T. et al., J. Electrochem. Soc. 2012, 159, A130.
(4) Hagen, M. et al., J. Electrochem. Soc. 2013, 160, A1205.