title: Electrochemical properties of yolk-shell structured ZnFe2O4 powders prepared by a simple spray drying process as anode material for lithium-ion battery.
abstract: ZnFe2O4 yolk-shell powders were prepared by applying a simple spray-drying process. Dextrin was used as a drying additive and carbon source material, and thus played a key role in the preparation of the powders. The combustion of precursor powders consisting of zinc and iron salts and dextrin obtained by a spray-drying process produced the yolk-shell-structured ZnFe2O4 powders even at a low post-treatment temperature of 350 °C. The ZnFe2O4 powders prepared from the spray solution without dextrin had a filled and pockmarked structure. The initial discharge capacities of the ZnFe2O4 yolk-shell and filled powders post-treated at 450 °C at a current density of 500 mA g(-1) were 1226 and 993 mA h g(-1), respectively, and the corresponding initial Coulombic efficiencies were 74 and 58%. The discharge capacities of the ZnFe2O4 powders with yolk-shell and filled structures post-treated at 450 °C after 200 cycles were 862 and 332 mA h g(-1), respectively. The ZnFe2O4 yolk-shell powders with high structural stability during cycling had superior electrochemical properties to those of the powders with filled structure.
authors.affiliation: Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea.
authors.forename: Jong Min
authors.initials: JM
authors.lastname: Won
authors.affiliation: Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea.
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Choi
authors.affiliation: Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea.
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Hong
authors.affiliation: Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea.
authors.forename: You Na
authors.initials: YN
authors.lastname: Ko
authors.affiliation: Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea.
authors.forename: Yun Chan
authors.initials: YC
authors.lastname: Kang