Graphene-Sulfur-Carbon Nanocomposite for High Performance Lithium-Sulfur BatteriesReport as inadecuate


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


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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

Abstract 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·g−1 and 1370 mAh·g−1, respectively, and a capacity retention of 63.8% can be achieved after 100 cycles at 0.1 C 1 C = 1675 mA·g−1. A relatively high specific capacity of 450 mAh·g−1 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





Author: Kangke Jin, Xufeng Zhou * and Zhaoping Liu *

Source: http://mdpi.com/



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