Electrochemical properties of yolk-shell structured ZnFe2O4 powders prepared by a simple spray drying process as anode material for lithium-ion battery

✍ Scribed by Won, Jong Min; Choi, Seung Ho; Hong, Young Jun; Ko, You Na; Kang, Yun Chan

• Book ID: 127192375
• Publisher: Springer Science and Business Media LLC
• Year: 2014
• Tongue: English
• Weight: 760 KB
• Volume: 4
• Category: Article
• ISSN: 2045-2322
• DOI: 10.1038/srep05857

✦ Synopsis

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.