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Issue 28, 2015
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Insight into lithium–metal anodes in lithium–sulfur batteries with a fluorinated ether electrolyte

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Abstract

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.

Graphical abstract: Insight into lithium–metal anodes in lithium–sulfur batteries with a fluorinated ether electrolyte

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Publication details

The article was received on 30 Apr 2015, accepted on 10 Jun 2015 and first published on 10 Jun 2015


Article type: Paper
DOI: 10.1039/C5TA03195H
J. Mater. Chem. A, 2015,3, 14864-14870

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    Insight into lithium–metal anodes in lithium–sulfur batteries with a fluorinated ether electrolyte

    C. Zu, N. Azimi, Z. Zhang and A. Manthiram, J. Mater. Chem. A, 2015, 3, 14864
    DOI: 10.1039/C5TA03195H

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