Powder properties of partially substituted LiMxMn2−xO4 (M=Al, Cr, Fe and Co) synthesized by ultrasonic spray pyrolysis
作者： Izumi Taniguchi
DOI: 10.1016/J.MATCHEMPHYS.2005.01.020
关键词: Crystallite 、 Nuclear chemistry 、 Impurity 、 Manganese 、 Specific surface area 、 Lithium 、 Metal 、 Transmission electron microscopy 、 Materials science 、 Mineralogy 、 Spinel 、 General Materials Science 、 Condensed matter physics
摘要: Abstract Powders of spinel lithium manganese oxide LiMn2O4 and its substituted forms LiMxMn2−xO4 (x = 0.05, 0.1, 0.2 0.3; M = Al, Cr, Fe Co) have been successfully synthesized using an ultrasonic spray pyrolysis technique. The effect Al, Co substitution on the powder properties oxides was examined by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area method, field emission scanning electron microscopy (FE-SEM) transmission (TEM). All samples exhibited a pure cubic structure without any impurities in XRD patterns. morphology changes from spherical porous to dense with increasing metal (Al, substitution. oxide, such as geometric mean diameter, crystallite size, specific area, were strongly affected composition, x, M (= Al, LiMxMn2−xO4. Spherical, particles larger size smaller could be technique when partially Cr at composition x ≥ 0.1 LiCrxMn2−xO4 x ≥ 0.2 LiFexMn2−xO4, respectively.
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