Encapsulation of S/SWNT with PANI web for enhanced rate and cycle performance in lithium sulfur batteries

Scientific Reports
Joo Hyun KimUngyu Paik

Abstract

Lithium-sulfur batteries show great potential to compete with lithium-ion batteries due to the fact that sulfur can deliver a high theoretical capacity of 1672 mAh/g and a high theoretical energy density of 2500 Wh/kg. But it has several problems to be solved in order to achieve high sulfur utilization with high Coulombic efficiency and long cycle life of Li-S batteries. These problems are mainly caused by the dissoluble polysulfide species, which are a series of complex reduced sulfur products, associating with shuttle effect between electrodes as well as side reactions on lithium metal anode. To alleviate these challenges, we developed a sulfur-carbon nanotube (S/SWNT) composite coated with polyaniline (PANI) polymer as polysulfide block to achieve high sulfur utilization, high Coulombic efficiency, and long cycle life. The PANI coated S/SWNT composite showed a superior specific capacity of 1011 mAh/g over 100 cycles and a good rate retention, demonstrating the synergic contribution of porous carbon and conducting polymer protection to address challenges underlying sulfur cathode.

References

Feb 8, 2008·Nature·M Armand, J-M Tarascon
Oct 25, 2011·Journal of the American Chemical Society·Liwen JiYuegang Zhang
Sep 12, 2012·Angewandte Chemie·Nam-Soon ChoiPeter G Bruce
Nov 8, 2012·Nature Communications·Yu-Sheng Su, Arumugam Manthiram
Oct 9, 2013·Chemical Communications : Chem Comm·Dominic BresserBruno Scrosati
Oct 12, 2013·Journal of the American Chemical Society·Weidong ZhouHéctor D Abruña
Nov 19, 2013·Angewandte Chemie·Ya-Xia YinLi-Jun Wan
Jul 16, 2014·Chemical Reviews·Arumugam ManthiramYu-Sheng Su

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Citations

Sep 18, 2015·Journal of the American Chemical Society·Qi FanHailiang Wang
Nov 8, 2016·Physical Chemistry Chemical Physics : PCCP·Zhicong LiangW T Zheng

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Methods Mentioned

BETA
scanning electron microscopy
X-ray
transmission electron microscopy

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