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Graphene/Sulfur/Carbon Nanocomposite for High Performance Lithium-Sulfur Batteries

Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219, Zhongguan West Road, Zhenhai District, Ningbo, Zhejiang 315201, China
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Academic Editor: Jiye Fang
Nanomaterials 2015, 5(3), 1481-1492; https://doi.org/10.3390/nano5031481
Received: 1 July 2015 / Revised: 18 August 2015 / Accepted: 28 August 2015 / Published: 1 September 2015
(This article belongs to the Special Issue Nanomaterials for Energy and Sustainability Applications)
Here, we report a two-step synthesis of graphene/sulfur/carbon ternary composite with a multilayer structure. In this composite, ultrathin S layers are uniformly deposited on graphene nanosheets and covered by a thin layer of amorphous carbon derived from β-cyclodextrin on the surface. Such a unique microstructure, not only improves the electrical conductivity of sulfur, but also effectively inhibits the dissolution of polysulfides during charging/discharging processes. As a result, this ternary nanocomposite exhibits excellent electrochemical performance. It can deliver a high initial discharge and charge capacity of 1410 mAh·g1 and 1370 mAh·g1, respectively, and a capacity retention of 63.8% can be achieved after 100 cycles at 0.1 C (1 C = 1675 mA·g1). A relatively high specific capacity of 450 mAh·g1 can still be retained after 200 cycles at a high rate of 2 C. The synthesis process introduced here is simple and broadly applicable to the modification of sulfur cathode for better electrochemical performance. View Full-Text
Keywords: Li-S battery; graphene; β-cyclodextrin; sulfur Li-S battery; graphene; β-cyclodextrin; sulfur
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MDPI and ACS Style

Jin, K.; Zhou, X.; Liu, Z. Graphene/Sulfur/Carbon Nanocomposite for High Performance Lithium-Sulfur Batteries. Nanomaterials 2015, 5, 1481-1492.

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