Original Article

Citation: NPG Asia Materials (2015) 7, e195; doi:10.1038/am.2015.63
Published online 26 June 2015

Three-dimensional-networked NiCo2S4 nanosheet array/carbon cloth anodes for high-performance lithium-ion batteries
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Rujia Zou1,2, Zhenyu Zhang1, Muk Fung Yuen1, Mingliang Sun1, Junqing Hu2, Chun-Sing Lee1 and Wenjun Zhang1

  1. 1Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China
  2. 2State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China

Correspondence: Professor J Hu or Professor W Zhang, Center of Super-Diamond and Advanced Films (COSDAF), Department Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, Hong Kong. E-mail: hu.junqing@dhu.edu.cn or apwjzh@cityu.edu.hk

Received 21 December 2014; Revised 19 March 2015; Accepted 27 April 2015

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Abstract

We present the design and synthesis of three-dimensional (3D)-networked NiCo2S4 nanosheet arrays (NSAs) grown on carbon cloth along with their novel application as anodes in lithium-ion batteries. The relatively small (~60%) volumetric expansion of NiCo2S4 nanosheets during the lithiation process was confirmed by in situ transmission electron microscopy and is attributed to their mesoporous nature. The 3D network structure of NiCo2S4 nanosheets offers the additional advantages of large surface area, efficient electron and ion transport capability, easy access of electrolyte to the electrode surface, sufficient void space and mechanical robustness. The fabricated electrodes exhibited outstanding lithium-storage performance including high specific capacity, excellent cycling stability and high rate of performance. A reversible capacity of ~1275mAhg−1 was obtained at a current density of 1000mAg−1, and the devices retained ~1137mAhg−1 after 100 cycles, which is the highest value reported to date for electrodes made of metal sulfide nanostructures or their composites. Our results suggest that 3D-networked NiCo2S4 NSA/carbon cloth composites are a promising material for electrodes in high-performance lithium-ion batteries.

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