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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

Abstract

Silicon suboxide (SiOx, x<2) is a promising candidate as anode materials, which has been widely used in lithium-ion batteries (LIBs) due to high lithium-ion storage capacity. However, SiOx possesses poor conductivity and 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 growing 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 the homogeneous dispersion of SiOx and NC at 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 LIB anodes, the VG@SiOx/NC composite shows a high reversible capacity of 1323.8 mAh g-1, excellent rate performance (265.5 mAh 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).

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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, Accepted Manuscript
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, Accepted Manuscript , DOI: 10.1039/C9TA12554J

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