Issue 63, 2017, Issue in Progress

Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries

Abstract

Transition metal sulfides (TMSs) are considered as the most promising alternative anode materials for advanced lithium-ion batteries (LIBs). Here, we report a hierarchically structured CoS2 nanosphere/graphene (CoS2/G) composite, fabricated by a simple hydrothermal method. This composite, assembled with CoS2 nanoparticles uniformly distributed on the graphene, exhibits excellent electrochemical performance. In particular, the CoS2/G electrode material delivers a high rate capability of around 398 mA h g−1 at a current density of 3500 mA g−1. Moreover, a discharge capacity of about 400 mA h g−1 can be obtained after 1000 cycles at a current density of 500 mA g−1. X-ray absorption spectroscopy is used to characterize the sample for the first time, and the results demonstrate that CoS2/G is reduced to metallic Co and Li2S when discharged to 0.01 V. In subsequent charge–discharge processes, the metallic Co cannot be fully oxidized to CoS2, which is the main cause of capacity loss for the CoS2 electrode.

Graphical abstract: Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
26 Jun 2017
Accepted
01 Aug 2017
First published
11 Aug 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 39427-39433

Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries

S. Tao, W. Huang, H. Xie, J. Zhang, Z. Wang, W. Chu, B. Qian and L. Song, RSC Adv., 2017, 7, 39427 DOI: 10.1039/C7RA07068C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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