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Author

Choi, Nam-Soon
Energy Materials Lab
Research Interests
  • Rechargeable lithium battery, electrolytes for next generation Mg and Na battery

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Activated natural porous silicate for a highly promising SiOx nanostructure finely impregnated with carbon nanofibers as a high performance anode material for lithium-ion batteries

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Title
Activated natural porous silicate for a highly promising SiOx nanostructure finely impregnated with carbon nanofibers as a high performance anode material for lithium-ion batteries
Author
Back, ChangkeunKim, TaijinChoi, Nam-Soon
Keywords
Anodes; Carbon nanofibers; Lithium batteries; Lithium compounds; Nanocomposites; Silicates; Sintering Chemical compositions; Coulombic efficiency; Cycling performance; Electrochemical activities; Electrochemical performance; High-performance anode materials; Lithium-ion battery; Nanostructure material
Issue Date
201409
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.33, pp.13648 - 13654
Abstract
A highly promising anode material with an amorphous SiOx nanostructure finely impregnated with carbon nanofibers is presented. The nanostructure material has a unique integral feature in that carbon nanofibers smaller than several nm in diameter are finely dispersed in amorphous SiO x media in an aligned manner. The synthetic route to fabricate the nanostructure is very simple and easy, using natural porous silicate, sepiolite, activated through the process of sintering and acid treatments on carbon source-loaded sepiolite nanocomposites. Upon the treatments, the nanocomposite material is changed in respect of its structure and chemical composition from crystalline Mg silicate to the carbon nanofiber-impregnated amorphous SiO x phase (CNF-SiOx nanostructure), and the electrochemical activity is greatly improved. The CNF-SiOx nanostructure exhibits excellent electrochemical performance with a reasonably high capacity of approximately 720 mA h g-1 for a current density of 70 mA g -1 (C/10 rate) and outstanding rate capability with a capacity retention of 96.8% for a current density of 700 mA g-1 and 87% at 1400 mA g-1 relative to that at 35 mA g-1, even at a high electrode loading level above 8 mg cm-2. The cycling performance is also very stable, with a capacity retention of 94.7% over 50 cycles at a rate of 350 mA g-1 and with a Coulombic efficiency above 99%.
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DOI
http://dx.doi.org/10.1039/c4ta02706j
ISSN
2050-7488
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