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Rational Design of yolk-shell Silicon dioxide@ hollow carbon spheres as advanced Li–S Cathode Hosts

Abstract

Short cycle life and low Coulombic efficiency, in conjunction with fast self-discharge, render lithium-sulfur batteries impractical for commercial applications. In this work, we demonstrate that a “yolk-shell” structure with a polar SiO2 core in the hollow carbon sphere (SiO2@HC) acts as a highly efficient sulfur host. Such nanoarchitecture benefits from both physical barrier and chemical adsorption via carbon shell and polar SiO2 core. Moreover, the internal void space could buffer the huge volume expansion of active sulfur during lithiation. The resulting SiO2@HC/S composite exhibits high mass sulfur loading (~76 wt%), high initial specific capacity of 1200 mAh g-1 at 0.2C, superior rate performance (728 mAh g-1 at 3C) ,ultraslow capacity decay of 0.056% per cycle at a high rate of 2C and an extraordinary anti-self-discharge feature.

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Publication details

The article was received on 16 Jun 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR04320A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Rational Design of yolk-shell Silicon dioxide@ hollow carbon spheres as advanced Li–S Cathode Hosts

    R. Wang, K. Wang, S. Gao, M. Jiang, M. Zhou, S. Cheng and K. Jiang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04320A

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