Electrochemical properties of core-shell structured NiO@SiO 2 ultrafine nanopowders below 10 nm for lithium-ion storages

Jong Min Won, Young Jun Hong, Jong Hwa Kim, Yun Ju Choi, Yun Chan Kang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Ultrafine core-shell NiO@SiO 2 nanopowders with various shell thicknesses were prepared by one-pot flame spray pyrolysis. The mean diameters of the NiO nanoparticles with 0, 2, and 5 wt% SiO 2 were 13, 10, and 9 nm, respectively. The coating of the NiO nanopowders with amorphous SiO 2 was confirmed by transmission electron microscopy, zeta potential analysis, and X-ray photoelectron spectroscopy. The initial discharge capacities of the NiO nanopowders with 0, 2, and 5 wt% SiO 2 at a current density of 1 A g -1 were 1123, 1165, and 1145 mA h g -1 , with corresponding initial Coulombic efficiencies of 66, 63, and 69%, respectively. The discharge capacities of the NiO nanopowders with 0, 2, and 5 wt% SiO 2 after 150 cycles were 440, 669, and 554 mA h g -1 , with capacity retentions from the second cycle of 58, 74, and 68%, respectively. The structural stability of the core-shell NiO@SiO 2 nanoparticles during repeated Li charging and discharging improved the cycling and rate performances of the electrodes as compared with those containing bare NiO nanopowders.

Original languageEnglish
Pages (from-to)835-842
Number of pages8
JournalElectrochimica Acta
Volume190
DOIs
Publication statusPublished - 2016 Feb 1

Keywords

  • Anode material
  • Core-shell
  • Flame spray pyrolysis
  • Lithium-ion battery
  • Nanopowders

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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