Disiloxane with nitrile end groups as Co-solvent for electrolytes in lithium–sulfur batteries – A feasible approach to replace LiNO 3

Tzach Mukra, Yonatan Horowitz, Inna Shekhtman, Meital Goor, Sara Drvarič Talian, Larisa Burstein, Johannes Kasnatscheew, Paul Meister, Mariano Grünebaum, Martin Winter, Hans Dieter Wiemhöfer, Diana Golodnitsky, Emanuel Peled*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The lithium-sulfur battery is a leading candidate for a new-generation Li-ion battery, because of its high theoretical capacity and abundance of sulfur. Yet, the flammability of either the organic-carbonate or ether-based electrolytes used in such battery systems is of concern. Moreover, the oxidation of Li 2 S leads to the formation of polysulfides (Li 2 S 3-8 ), which dissolve in the electrolyte and initiate a shuttle mechanism, which results in low Coulombic efficiency and growth of a thick SEI on the anode. Therefore, various electrolyte additives, like LiNO 3 , are added to the electrolyte. Unfortunately, the nitrate additive is gradually consumed and the “shuttle effect” resumes. Here we present a LiNO 3 -free electrolyte consisting of nitrile-functionalized disiloxane (TmdSx-CN) with dissolved LiTFSI as a candidate electrolyte for lithium-sulfur batteries. We have examined the effect of TmdSx-CN as a co-solvent along with 1,3-dioxolane (DOL) on the performance of Li/S cells. It was found that LiNO 3 -free TmdSx-CN:DOL electrolyte mitigates the polysulfide shuttle. The cell containing this electrolyte yields an average capacity of 700 mAh g −1 and 96% Coulombic efficiency for more than 100 cycles. Moreover, 87.5% energy efficiency, which is similar to the LiNO 3 -based control cell. We expect that our preliminary results will encourage the further use of siloxane-based electrolytes in metallic-lithium battery systems, and specifically, in lithium-sulfur batteries.

Original languageEnglish
Pages (from-to)76-82
Number of pages7
JournalElectrochimica Acta
Volume307
DOIs
StatePublished - 1 Jun 2019

Funding

FundersFunder number
Horizon 2020-HELIS3-14084
Israel's Ministry of Science and Technology
Horizon 2020 Framework Programme666221
Israel Science Foundation
Ministry of Science and Technology, Israel

    Keywords

    • Battery
    • Co-solvent
    • Electrolyte
    • Lithium
    • Siloxane
    • Sulfur

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