NDLI: Enhanced kinetics of polysulfide redox reactions on $Mo

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Enhanced kinetics of polysulfide redox reactions on $Mo_{2}$C/CNT in lithium–sulfur batteries

Content Provider	Scilit
Author	Razaq, Rameez Sun, Dan Xin, Ying Li, Qian Huang, Taizhong Zheng, Lei Zhang, Zhaoliang Huang, Yunhui
Copyright Year	2018
Description	Journal: Nanotechnology Among different energy storage devices, lithium-sulfur (Li-S) battery is the subject of recent attention. However, capacity decay caused by polysulfide shuttle leading to sluggish kinetics of polysulfide redox reactions is the main hindrance for its practical application of Li-S battery. Herein molybdenum carbide nanoparticles anchored on carbon nanotubes (Mo2C/CNT) are reported to serve an efficient cathode material to enhance the electrochemical kinetics of polysulfide conversion in Li-S batteries. Mo2C/CNT shows strong adsorption and activation of polar polysulfides and therefore accelerates redox kinetics of polysulfides, reduces the energy barrier, effectively mitigates the polarization and polysulfide shuttle, thus improving electrochemical performances. The S-Mo2C/CNT composite with 70 wt.% sulfur loading exhibits high specific discharge capacity (1206 mA h g -1at 0.5 C), excellent high-rate performance, long cycle life (900 cycles) and outstanding Coulombic efficiency (~100 %) at high rate (2 C) corresponding to capacity decay of 0.05% only. Remarkably, the S-Mo2C/CNT cathode with high areal sulfur loading of 2.5 mg cm−2 exhibits high rate capacities and stable cycling performance over 100 cycles, offering a potential for use in high energy Li-S battery.
Related Links	http://iopscience.iop.org/article/10.1088/1361-6528/aac060/pdf
ISSN	09574484
e-ISSN	13616528
DOI	10.1088/1361-6528/aac060
Journal	Nanotechnology
Issue Number	29
Volume Number	29
Language	English
Publisher	IOP Publishing
Publisher Date	2018-04-26
Access Restriction	Open
Subject Keyword	Journal: Nanotechnology Lithium-sulfur Batteries Molybdenum Carbides Polysulfide Shuttle Electrochemical Kinetics
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering

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