title: Yolk-shelled cathode materials with extremely high electrochemical performances prepared by spray pyrolysis.
abstract: A facile, continuous preparation process of yolk-shell-structured lithium-metal oxide powders without a template for use as cathode materials in lithium ion batteries is introduced for the first time. Single and double-shelled LiNi0.5Mn1.5O4 yolk-shell powders as the first target materials are prepared directly by spray pyrolysis from a spray solution with sucrose, at a short residence time of 4 s. Fast combustion and contraction of a carbon-mixed oxide composite intermediate, formed from a micro-sized droplet inside a hot wall reactor maintained at 700 °C, produces the yolk-shell powders. The yolk-shell structure of the precursor powders directly prepared by spray pyrolysis is well maintained even at a high post-treatment temperature of 750 °C. The yolk-shell LiNi0.5Mn1.5O4 powders delivered a 1000(th) high discharge capacity of 108 mA h g(-1) at 10 C. The discharge capacities are as high as 103, 95, and 91 mA h g(-1) at extremely high discharge rates of 100, 200, and 300 C and the corresponding specific energy densities are 420, 370, and 328 W h kg(-1). The capacity retention at a constant discharge rate of 200 C is 90% after 500 cycles.
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.forename: Young Jun
authors.initials: YJ
authors.lastname: Hong
authors.forename: Yun Chan
authors.initials: YC
authors.lastname: Kang
mesh_terms: D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D006358:Hot Temperature; D008094:Lithium / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D013395:Sucrose / Q000737:chemistry
chemical_list: D010087:Oxides; D013395:Sucrose; D008094:Lithium