Journal
ELECTROCHIMICA ACTA
Volume 155, Issue -, Pages 85-92Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.12.074
Keywords
nickel sulfide; graphene; electrochemical properties; anode; lithium ion batteries
Categories
Funding
- National Basic Research Program of China [2013CB934003]
- 863 program [2013AA050902]
- National Nature Science Foundation of China [21273019]
- Guangdong Industry-Academy-Research Alliance [2013C2FC0015]
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A well-designed hierarchical architecture NiS@SiO2/graphene is prepared through electrostatic self-assembly between (3-aminopropyl) triethoxysilane (APTES)-modified NiS and graphene in aqueous solutions at room temperature. The obtained composite possesses a unique structure with SiO2 ultrasmall nanoparticles (3-5 nm) derived from the pyrolysis of APTES homogeneously anchored on the surface of NiS nanoparticles (100 nm), forming NiS@SiO2 core-shell hybrid particles, which are well enveloped in graphene sheets. The SiO2 nanoparticles act as pillars to form open space between graphene sheets and NiS particles, which can buffer the volume change and afford easy electrolyte-wetting and fast lithium ion transport channels. The graphene sheets can not only significantly enhance the overall electrical conductivity of the NiS@SiO2/graphene electrode, but also serve as a blanket to wrap NiS particle and so as to avert its exfoliation from electrode due to large volume change during cycling. The prepared NiS@SiO2/graphene nanocomposite exhibits high reversible capacity (similar to 750 mAhg(-1) for 100 cycles), remarkable cycling stability and impressive rate capability. (C) 2014 Elsevier Ltd. All rights reserved.
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