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Insight into lithium–metal anodes in lithium–sulfur batteries with a fluorinated ether electrolyte
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2015-01, Vol.3 (28), p.14864-14870
Erscheinungsjahr
2015
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
High energy density Li-S batteries are a promising green battery chemistry, but polysulfide shuttling and lithium anode degradation hinder the practical use of Li-S batteries. Tremendous efforts have been made including confining sulfur in a closed cathode porous matrix and stabilizing lithium-metal anodes with additives; however, satisfactory confinement is challenging to achieve and electrolyte additives could be electrochemically unstable, deteriorating the long-term cyclability of Li-S batteries. Here, we demonstrate the control of polysulfide shuttling and stabilization of the lithium-metal anode with a fluorinated ether electrolyte without either cathode confinement or additives, which can be beneficial for both the efficient use of electrolytes and safe operation of Li-S batteries. Moreover, a solid-electrolyte interphase (SEI) layer with a hierarchical chemical composition of LiF and sulfate/sulfite/sulfide was identified on lithium anodes, which suppresses parasitic reactions and helps preserve the anode quality.