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Issue 39, 2017
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Rational design of yolk–shell silicon dioxide@hollow carbon spheres as advanced Li–S cathode hosts

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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 demonstrated that a “yolk–shell” structure with a polar silicon dioxide (SiO2) core in a hollow carbon sphere (SiO2@HC) acts as a highly efficient sulfur host. Such nanoarchitecture benefits from both a physical barrier and chemical adsorption via a carbon shell and a polar SiO2 core. Furthermore, the internal void space could buffer the huge volume expansion of active sulfur during lithiation. The resulting SiO2@HC/S composite exhibits a high mass S loading (∼76 wt%), high initial specific capacity of 1200 mA h g−1 at 0.2C, superior rate performance (728 mA h 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.

Graphical abstract: Rational design of yolk–shell silicon dioxide@hollow carbon spheres as advanced Li–S cathode hosts

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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, 2017,9, 14881-14887
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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, 9, 14881
    DOI: 10.1039/C7NR04320A

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