Si/Co-CoSi2/reduced graphene oxide ternary nanocomposite anodes for Li-Ion batteries with enhanced capacity and cycling stability

Title
Si/Co-CoSi2/reduced graphene oxide ternary nanocomposite anodes for Li-Ion batteries with enhanced capacity and cycling stability
Authors
이중기김아영A Reum ParkMyeong Gyun NamKwang Su KimMd. Selim Arif Sher ShahJun Young LeeWoo-Jae KimPil J. Yoo
Keywords
Silicon; Cobalt silicide; Reduced graphene oxide; Lithium-ion batteries; Anodes; Ternary nanocomposites
Issue Date
2017-11
Publisher
Journal of alloys and compounds
Citation
VOL 724-1142
Abstract
Silicon (Si) is a promising anode material for high-performance Li-ion batteries (LIBs), but it undergoes rapid capacity fading through severe volumetric expansion during Li insertion/extraction. Although alloying Si with various metal sources has been pursued to mitigate the structural deterioration, the resulting materials have shown the intrinsic problem of low electrical conductivity. To address this conflicting issue, here we describe a novel ternary nanocomposite of Si/Co-CoSi2/reduced graphene oxide (rGO) made using a facile process of mechanical mixing of Si nanoparticles, Co3O4 microparticles, and rGO nanosheets, followed by carbothermal reduction. Specifically, rGO, which has high electrical conductivity and structural integrity, could work as both a conductive matrix and a reducing agent in forming the Co-CoSi2 phase inside the Si domains during thermal treatment. The proposed ternary nanocomposites exhibited a noteworthy specific capacity of 952 mA h g(-1) with 79.3% capacity retention after 80 cycles at a current density of 100 mA g(-1). We attribute the improved electrochemical performance to the increased structural stability offered by the Co-CoSi2 phase and the interconnected conductive framework of the rGO nanosheets. Therefore, we expect our design process for Si/Co-CoSi2/ rGO ternary nanocomposites to be applicable to other materials that can eventually be used as highperformance anodes for the next generation LIBs.
URI
http://pubs.kist.re.kr/handle/201004/68264
ISSN
0925-8388
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KIST Publication > Article
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