Abstract
A spray-drying process was used to coat a Li(Li 0.033Mn 1.967)O 4 powder with a spinel-type Li–Mn–Co–O surface layer. After high-temperature (850 °C) annealing, the coated powder was made into a positive electrode for rechargeable lithium cells. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectrometry (EDAX) were applied to analyze the structure of the annealed powders. It is found that a spinel-type Li[Mn 1.56(1− δ) Co 0.44(1− δ) Li 2 δ ]O 4 layer was probably formed on the Li(Li 0.033Mn 1.967)O 4 particles. The particle size distribution of the spray-treated powder becomes narrower than the original Li(Li 0.033Mn 1.967)O 4 powder. As the active positive electrode material, the coated Li(Li 0.033Mn 1.967)O 4 powder shows excellent electrochemical properties, especially in suppressing the capacity fading during elevated temperature cycling (with a fading rate of 0.045% per cycle). The rate capability of the cells is also improved as a result of this treatment.
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