In Situ EQCM Study Examining Irreversible Changes the Sulfur-Carbon Cathode in Lithium-Sulfur Batteries

ACS Applied Materials & Interfaces
Heng-Liang WuAndrew A Gewirth

Abstract

In situ EQCM experiments were used to investigate the stability and roughness changes occurring in a sulfur-carbon cathode utilized for a Li-S battery during the charge-discharge process. Results show that the sulfur-carbon cathode gains mass during the first discharge plateau (∼2.4 V) due to the formation of the long chain polysulfides during the discharge (lithiation) process. However, further discharge to below 2.4 V yields an increase in the crystal resistance (Rc) suggesting the sulfur-carbon cathode becomes rougher. During the charge (delithiation) process, the roughness of the sulfur-carbon cathode decreases. Time dependent measurements show that the electrode surface becomes rougher with the deeper discharge, with the change occurring following a step to 1.5 V. The sulfur-carbon cathode exhibits stable Rc and frequency behavior initially, but then becomes rougher in subsequent following cycles.

References

Oct 14, 2011·The Journal of Physical Chemistry. B·Ninie S A MananChristopher Hardacre
Dec 16, 2011·Nature Materials·Peter G BruceJean-Marie Tarascon
Mar 22, 2012·Journal of the American Chemical Society·Johanna NelsonMichael F Toney
May 30, 2014·Journal of the American Chemical Society·Wan-Yu TsaiPatrice Simon
Jul 16, 2014·Chemical Reviews·Arumugam ManthiramYu-Sheng Su
Nov 11, 2014·Journal of the American Chemical Society·Kimberly A SeeRam Seshadri
Dec 30, 2014·ACS Applied Materials & Interfaces·Heng-Liang WuAndrew A Gewirth
Feb 18, 2015·Advanced Materials·Arumugam ManthiramChenxi Zu
Mar 6, 2015·ACS Applied Materials & Interfaces·Zhenzhen YangLynn Trahey
May 1, 2014·The Journal of Physical Chemistry Letters·Tod A PascalDavid Prendergast

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