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Research Article

A non-nucleophilic gel polymer magnesium electrolyte compatible with sulfur cathode

Haiyan Fan1,2, Yuxing Zhao3, Jianhua Xiao3, Jifang Zhang3, Min Wang1,2, Yuegang Zhang2,3( )
School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Department of Physics, Tsinghua University, Beijing 100084, China
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Abstract

Magnesium/sulfur battery (Mg/S) has recently received wide attention due to its high theoretical energy density (3,260 Wh/L) and low cost. To further improve its safety and flexibility, developing a polymer electrolyte that can be compatible with both electrophilic S and Mg is critical. Here, we report a magnesium chloride-(fluorinated tetraethylene glycolic)borate (MgCl-FTGB) based non-nucleophilic, gel-type polymer electrolyte for Mg/S battery via a facile synthetic method through commercially available reagents. This electrolyte coupled with glass fiber allows reversible Mg deposition/dissolution (100% coulombic efficiency) with low polarization (500 μA/cm2, 300/300 mV), and shows a wide electrochemical window of 4.8 V (vs. Mg/Mg2+). Mg/S battery assembled with this electrolyte can cycle over 50 times with a high specific discharge capacity retention of over 1,100 mAh/g.

Keywords

magnesium/sulfur batterypolymer electrolytenon-nucleophilic electrolytesafety

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Nano Research
Volume 13 Issue 10,
October 2020
Pages 2749-2754
DOI: 10.1007/s12274-020-2923-5
Cite this article:
Fan H, Zhao Y, Xiao J, et al. A non-nucleophilic gel polymer magnesium electrolyte compatible with sulfur cathode. Nano Research, 2020, 13(10): 2749-2754. https://doi.org/10.1007/s12274-020-2923-5
Topics:
Chlorine compoundsElectric batteries Magnesium compoundsSulfur

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Received: 21 March 2020
Revised: 01 June 2020
Accepted: 05 June 2020
Published: 05 October 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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