TY - JOUR
T1 - Electrochemical properties of core-shell structured NiO@SiO2 ultrafine nanopowders below 10 nm for lithium-ion storages
AU - Won, Jong Min
AU - Hong, Young Jun
AU - Kim, Jong Hwa
AU - Choi, Yun Ju
AU - Kang, Yun Chan
N1 - Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - Ultrafine core-shell NiO@SiO2 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% SiO2 were 13, 10, and 9 nm, respectively. The coating of the NiO nanopowders with amorphous SiO2 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% SiO2 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% SiO2 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@SiO2 nanoparticles during repeated Li charging and discharging improved the cycling and rate performances of the electrodes as compared with those containing bare NiO nanopowders.
AB - Ultrafine core-shell NiO@SiO2 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% SiO2 were 13, 10, and 9 nm, respectively. The coating of the NiO nanopowders with amorphous SiO2 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% SiO2 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% SiO2 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@SiO2 nanoparticles during repeated Li charging and discharging improved the cycling and rate performances of the electrodes as compared with those containing bare NiO nanopowders.
KW - Anode material
KW - Core-shell
KW - Flame spray pyrolysis
KW - Lithium-ion battery
KW - Nanopowders
UR - http://www.scopus.com/inward/record.url?scp=84954270962&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84954270962&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2015.12.197
DO - 10.1016/j.electacta.2015.12.197
M3 - Article
AN - SCOPUS:84954270962
VL - 190
SP - 835
EP - 842
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -