Performance enhancement of a graphene–sulfur composite as a lithium–sulfur battery electrode by coating with an ultrathin Al2O3 film via atomic layer deposition

Mingpeng Yu; Wenjing Yuan; Chun Li; Jong-Dal Hong; Gaoquan Shi

doi:10.1039/C4TA00234B

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Performance enhancement of a graphene–sulfur composite as a lithium–sulfur battery electrode by coating with an ultrathin Al₂O₃ film via atomic layer deposition†

Mingpeng Yu,^a Wenjing Yuan,^a Chun Li,^a Jong-Dal Hong^b and Gaoquan Shi*^a

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* Corresponding authors

^a Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
E-mail: gshi@tsinghua.edu.cn
Fax: +86 62771149
Tel: +86 6277 3743

^b Department of Chemistry, Incheon National University, 406-772 Incheon, South Korea

Abstract

A graphene–sulfur (G–S) composite was conformally coated with an ultrathin Al₂O₃ film via atomic layer deposition (ALD) and used as the cathode of a lithium–sulfur (Li–S) battery. The G–S composite cathode with an ALD-Al₂O₃ coating delivered a high specific capacity of 646 mA h g⁻¹ after 100 charge–discharge cycles at 0.5 C, and this value is about twice that of the bare G–S composite. The rate capability and coulombic efficiency of the G–S composite electrode were also greatly increased. The ALD-Al₂O₃ coating worked as an artificial barrier to suppress the dissolution of polysulfides and alleviate the shuttle effect; thus, it effectively improved the performance of a G–S composite cathode in a Li–S battery.

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Article information

DOI: https://doi.org/10.1039/C4TA00234B
Article type: Paper
Submitted: 15 Jan 2014
Accepted: 21 Feb 2014
First published: 21 Feb 2014

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J. Mater. Chem. A, 2014,2, 7360-7366

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Performance enhancement of a graphene–sulfur composite as a lithium–sulfur battery electrode by coating with an ultrathin Al₂O₃ film via atomic layer deposition

M. Yu, W. Yuan, C. Li, J. Hong and G. Shi, J. Mater. Chem. A, 2014, 2, 7360 DOI: 10.1039/C4TA00234B

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Journal of Materials Chemistry A