This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1016/j.electacta.2019.03.144 in citations.
Disiloxane with nitrile end groups as Co-solvent for electrolytes in lithium sulfur batteries – A feasible approach to replace LiNO3
Disiloxane with nitrile end groups as Co-solvent for electrolytes in lithium sulfur batteries – A feasible approach to replace LiNO3
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 oxidati...
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Personal Name(s): | Mukra, Tzach |
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Horowitz, Yonatan / Shekhtman, Inna / Goor, Meital / Drvarič Talian, Sara / Burstein, Larisa / Kasnatscheew, Johannes / Meister, Paul / Grünebaum, Mariano / Winter, Martin / Wiemhöfer, Hans-Dieter / Golodnitsky, Diana (Corresponding author) / Peled, Emanuel (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 |
Published in: | Electrochimica acta, 307 (2019) S. 76 - 82 |
Imprint: |
New York, NY [u.a.]
Elsevier
2019
|
DOI: |
10.1016/j.electacta.2019.03.144 |
Document Type: |
Journal Article |
Research Program: |
Electrochemical Storage |
Publikationsportal JuSER |
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 Li2S leads to the formation of polysulfides (Li2S3-8), 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 LiNO3, are added to the electrolyte. Unfortunately, the nitrate additive is gradually consumed and the “shuttle effect” resumes.Here we present a LiNO3-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 LiNO3-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 LiNO3-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. |