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Li2S@C composite incorporated into 3D reduced graphene oxide as a cathode material for lithium-sulfur batteries

Li2S@C composite incorporated into 3D reduced graphene oxide as a cathode material for lithium-sulfur batteries

Authors :
Donghuang Wang
C.D. Gu
X.H. Xia
J.P. Tu
Yu Zhong
Tao Yang
Dong Xie
X.L. Wang
Source :
Journal of Power Sources. 313:233-239
Publication Year :
2016
Publisher :
Elsevier BV, 2016.

Abstract

Surface conductive engineering on Li 2 S is critical for construction of advanced cathodes of lithium-sulfur batteries. Herein, we construct a high-performance Li 2 S-based composite cathode with the help of three-dimensional reduced graphene oxide (3D-rGO) network and outer carbon coating. Typically, the Li 2 S@C particles are uniformly embedded into 3D-rGO to form a binder-free 3D-rGO-Li 2 S@C cathode by the combination of a liquid solution-evaporation coating and PVP (Polyvinyl Pyrrolidone) carbonization. The 3D-rGO-Li 2 S@C cathode exhibits a high initial discharge capacity of 856 mAh g −1 at 0.1C, superior cycling stability with a capacity of 388.4 mAh g −1 after 200 cycles at 1C, corresponding to a low capacity fading rate. It is demonstrated that the outer conductive coating is effective and necessary for electrochemical enhancement of Li 2 S cathodes by improving electrical conductivity and prohibiting polysulfide from shuttling during cycling.

Details

ISSN :
03787753
Volume :
313
Database :
OpenAIRE
Journal :
Journal of Power Sources
Accession number :
edsair.doi...........04ca4251f0d62982e2edae917f2cf061
Full Text :
https://doi.org/10.1016/j.jpowsour.2016.03.001