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A Polysulfide-Infiltrated Carbon Cloth Cathode for High-Performance Flexible Lithium–Sulfur Batteries

1
School of Chemical Engineering, Chonnam National University, 77 Yongbongro, Buk-gu, Gwangju 61186, Korea
2
Division of Electron Microscopy Research, Korea Basic Science Institute (KBSI), Daejeon 34133, Korea
3
Department of Biological Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 22212, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(2), 90; https://doi.org/10.3390/nano8020090
Received: 10 January 2018 / Revised: 26 January 2018 / Accepted: 29 January 2018 / Published: 7 February 2018
(This article belongs to the Special Issue Nanomaterials and Nanoengineering for Sulfur-Based Batteries)
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Abstract

For practical application of lithium–sulfur batteries (LSBs), it is crucial to develop sulfur cathodes with high areal capacity and cycle stability in a simple and inexpensive manner. In this study, a carbon cloth infiltrated with a sulfur-containing electrolyte solution (CC-S) was utilized as an additive-free, flexible, high-sulfur-loading cathode. A freestanding carbon cloth performed double duty as a current collector and a sulfur-supporting/trapping material. The active material in the form of Li2S6 dissolved in a 1 M LiTFSI-DOL/DME solution was simply infiltrated into the carbon cloth (CC) during cell fabrication, and its optimal loading amount was found to be in a range between 2 and 10 mg/cm2 via electrochemical characterization. It was found that the interwoven carbon microfibers retained structural integrity against volume expansion/contraction and that the embedded uniform micropores enabled a high loading and an efficient trapping of sulfur species during cycling. The LSB coin cell employing the CC-S electrode with an areal sulfur loading of 6 mg/cm2 exhibited a high areal capacity of 4.3 and 3.2 mAh/cm2 at C/10 for 145 cycles and C/3 for 200 cycles, respectively, with minor capacity loss (<0.03%/cycle). More importantly, such high performance could also be realized in flexible pouch cells with dimensions of 2 cm × 6 cm before and after 300 bending cycles. Simple and inexpensive preparation of sulfur cathodes using CC-S electrodes, therefore, has great potential for the manufacture of high-performance flexible LSBs. View Full-Text
Keywords: lithium–sulfur batteries; flexible batteries; carbon cloth; microporous carbon; catholytes lithium–sulfur batteries; flexible batteries; carbon cloth; microporous carbon; catholytes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Song, J.-Y.; Lee, H.-H.; Hong, W.G.; Huh, Y.S.; Lee, Y.S.; Kim, H.J.; Jun, Y.-S. A Polysulfide-Infiltrated Carbon Cloth Cathode for High-Performance Flexible Lithium–Sulfur Batteries. Nanomaterials 2018, 8, 90.

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