Self-assembly of silicon/carbon hybrids and natural graphite as anode materials for lithium-ion batteriesElectronic supplementary information (ESI) available. See DOI: 10.1039/c6ra20131h
Silicon/carbon/natural graphite (Si-C-NG) composites have been successfully prepared by the granulation of natural graphite (NG) and silicon/poly(acrylonitrile- co -divinylbenzene) [Si/poly(AN- co -DVB)] hybrid microspheres via spray drying and subsequent pyrolysis. The poly(AN- co -DVB) microsphere...
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Main Authors | , , , |
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Format | Journal Article |
Language | English |
Published |
03.11.2016
|
Online Access | Get full text |
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Summary: | Silicon/carbon/natural graphite (Si-C-NG) composites have been successfully prepared by the granulation of natural graphite (NG) and silicon/poly(acrylonitrile-
co
-divinylbenzene) [Si/poly(AN-
co
-DVB)] hybrid microspheres
via
spray drying and subsequent pyrolysis. The poly(AN-
co
-DVB) microspheres containing silicon nano-flakes are synthesized by microsuspension polymerization using benzoyl peroxide (BPO) as initiator and polyvinyl alcohol (PVA) as dispersant in aqueous phase. The morphology and microstructure of Si-C-NG composites are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy. It is found that the Si nanoparticles are uniformly enwrapped by pyrolytic carbon derived from poly(AN-
co
-DVB) to form Si-C core/shell structures, which are subsequently decorated on the surface of NG, resulting in a spherical Si-C-NG structure. When used as anode materials for lithium-ion batteries, the Si-C-NG composites exhibit a high specific capacity of 471.5 mA h g
−1
, a high initial coulombic efficiency of 78.4%, and a good cycling stability with capacity retention of 87.9% after 100 cycles at a current density of 100 mA g
−1
.
Si-C-NG composites exhibit a high specific capacity, a high initial coulombic efficiency, and a good cycling stability with capacity retention after 100 cycles at a current density of 100 mA g
−1
. |
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Bibliography: | 10.1039/c6ra20131h Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2046-2069 |
DOI: | 10.1039/c6ra20131h |