Issue 55, 2015

Improving the electrochemical performance of a lithium–sulfur battery with a conductive polymer-coated sulfur cathode

Abstract

Low sulfur utilization, poor cycle life, and the security problems caused by a Li metal anode are the main drawbacks hindering the practical application of lithium–sulfur batteries. Here we report a facile modification of the traditional sulfur cathode to achieve a high capacity and considerably improved cycle life. By coating a commercially-purchased conductive polymer PEDOT:PSS onto the surface of a pristine sulfur electrode, a significant enhancement is achieved in both sulfur utilization and capacity retention. With this strategy, gravimetric energy densities of the cell with the modified S cathode are estimated to 1113 W h kg−1 based on the total composition of the electrode. The PEDOT:PSS film not only serves as a soft buffer to restrict the polysulfides immigrating to the lithium anode, suppresses mechanical stress and sustains a stable electrode, but also provides more active surfaces to capture and reutilize the polysulfides.

Graphical abstract: Improving the electrochemical performance of a lithium–sulfur battery with a conductive polymer-coated sulfur cathode

Supplementary files

Article information

Article type
Paper
Submitted
27 3 2015
Accepted
08 5 2015
First published
08 5 2015

RSC Adv., 2015,5, 44160-44164

Author version available

Improving the electrochemical performance of a lithium–sulfur battery with a conductive polymer-coated sulfur cathode

Y. Li, L. Yuan, Z. Li, Y. Qi, C. Wu, J. Liu and Y. Huang, RSC Adv., 2015, 5, 44160 DOI: 10.1039/C5RA05481H

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