Graphene-Sulfur-Carbon Nanocomposite for High Performance Lithium-Sulfur BatteriesReportar como inadecuado


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


Graphene-Sulfur-Carbon Nanocomposite for High Performance Lithium-Sulfur Batteries - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

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





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

Fuente: http://mdpi.com/



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