Details

Autor(en) / Beteiligte

• Zu, Chenxi
• Azimi, Nasim
• Zhang, Zhengcheng
• Manthiram, Arumugam

Titel

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.