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Issue 7, 2020
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Vertical graphene growth on uniformly dispersed sub-nanoscale SiOx/N-doped carbon composite microspheres with a 3D conductive network and an ultra-low volume deformation for fast and stable lithium-ion storage

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Abstract

Silicon suboxide (SiOx, x < 2) is a promising candidate anode material, which has been widely used in lithium-ion batteries (LIBs) due to its high lithium-ion storage capacity. However, SiOx has poor conductivity and undergoes large volume change, resulting in poor rate capability and stability during cycling. Herein, a vertical graphene@SiOx/N-doped carbon (VG@SiOx/NC) composite is easily prepared by the radially oriented growth of VG on SiOCN microspheres obtained by the pyrolysis of 1,3-bis(3-aminopropyl)tetramethyldisiloxane in a sealed vessel under thermal chemical vapor deposition (CVD) conditions. The SiOCN microspheres are transformed into SiOx/NC microspheres with homogeneously dispersed SiOx and NC at the sub-nanoscale in the CVD process. The uniformly dispersed sub-nanoscale NC in the spheres of SiOx/NC and the surface VG construct a 3D conductive and robust network, resulting in fast and stable lithium ion intercalation/deintercalation. As an LIB anode, the VG@SiOx/NC composite shows a high reversible capacity of 1323.8 mA h g−1, excellent rate performance (265.5 mA h g−1 at 20 A g−1), and long cycling life (over 500 cycles with 84.2% of capacity retention at 2 A g−1).

Graphical abstract: Vertical graphene growth on uniformly dispersed sub-nanoscale SiOx/N-doped carbon composite microspheres with a 3D conductive network and an ultra-low volume deformation for fast and stable lithium-ion storage

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Supplementary files

Article information


Submitted
15 Nov 2019
Accepted
15 Jan 2020
First published
15 Jan 2020

J. Mater. Chem. A, 2020,8, 3822-3833
Article type
Paper

Vertical graphene growth on uniformly dispersed sub-nanoscale SiOx/N-doped carbon composite microspheres with a 3D conductive network and an ultra-low volume deformation for fast and stable lithium-ion storage

M. Han, Y. Mu, F. Yuan, J. Liang, T. Jiang, X. Bai and J. Yu, J. Mater. Chem. A, 2020, 8, 3822
DOI: 10.1039/C9TA12554J

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