Abstract
xLiNi1/3Co1/3Mn1/3O2-LiMn1.95Ni0.05O3.98F0.02 composite cathode materials with various mass ratios (x=5.0%, 7.5%, and 10.0%) are prepared by the Pechini method. The relationship between the structural and electrochemical properties of the layer–spinel composite cathode materials is investigated. XRD shows the composite materials still possess cubic spinel structure of the pristine matrix (space group of Fd3¯m). SEM and TEM show that a uniform coating layer of polycrystalline LiNi1/3Co1/3Mn1/3O2 was formed on the surface of the octahedral spinel grains. 10.0% LiNi1/3Co1/3Mn1/3O2-90.0%LiMn1.95Ni0.05O3.98F0.02 cathode exhibits better cycle performance and rate capability at elevated temperature (i.e., 55°C) arising from the protective role of layer of LiNi1/3Co1/3Mn1/3O2. The coating material, LiNi1/3Co1/3Mn1/3O2, is one of most widely applied cathodes for lithium-ion batteries as well, which possesses high capacity retention, rate ability and discharge capacity at elevated temperatures, not only protect spinel LiMn1.95Ni0.05O3.98F0.02 from electrolyte corroding but also enhance Li-ion transport compared with inert coatings.
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