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Graphene wrapping as a protective clamping layer anchored to carbon nanofibers encapsulating Si nanoparticles for a Li-ion battery anode

Authors
Shin, JungwooPark, KyusungRyu, Won-HeeJung, Ji-WonKim, Il-Doo
Issue Date
Nov-2014
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.6, no.21, pp 12718 - 12726
Pages
9
Journal Title
NANOSCALE
Volume
6
Number
21
Start Page
12718
End Page
12726
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147377
DOI
10.1039/c4nr03173c
ISSN
2040-3364
2040-3372
Abstract
Carbon nanofibers encapsulating Si nanoparticles (CNFs/SiNPs) were prepared via an electrospinning method and chemically functionalized with 3-aminopropyltriethoxysilane (APS) to be grafted onto graphene oxide (GO). As a result, the thin and flexible GO, which exhibits a negative charge in aqueous solution, fully wrapped around the APS-functionalized CNFs with a positive surface charge via electrostatic self-assembly. After the formation of chemical bonds between the epoxy groups on GO and the amine groups in APS via an epoxy ring opening reaction, the GO was chemically reduced to a reduced graphene oxide (rGO). Electrochemical and morphological characterizations showed that capacity loss by structural degradation and electrolyte decomposition on Si surface were significantly suppressed in the rGOwrapped CNFs/SiNPs (CNFs/SiNPs@rGO). Superior capacities were consequently maintained for up to 200 cycles at a high current density (1048 mA h g(-1) at 890 mA g(-1)) compared to CNFs/SiNPs without the rGO wrapping (304 mA h g(-1) at 890 mA g(-1)). Moreover, the resistance of the SEI layer and charge transfer resistance were also considerably reduced by 24% and 88%, respectively. The described graphene wrapping offers a versatile way to enhance the mechanical integrity and electrochemical stability of Si composite anode
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공과대학 (화공생명공학부)
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