Preparation and Characterization of Lithium-rich Layereds Oxides by Self-propagating Method and Lithium Storage Performance
Due to the excellent properties of high specific capacity,high voltage range and long cycle,the application of Li-rich cathode materials in the field of lithium-ion batteries has attracted wide attention.In this paper,the lithium rich cathode material xLi2MnO3·(1-x)LiNi1/3Co1/3Mn1/3O2(x=0.4,0.5,0.6)was prepared by self-propagating combustion method.The effects of x value and sintering temperature on the morphology and electro-chemical properties of the material were investigated.The phase structure and micro-structure of the materials were characterized through the application of X-ray diffraction(XRD),scanning electron microscopy(SEM),specific surface and particle size analysis.The influence of the materials on their electro-chemical properties was discussed.The samples are all pure phase layered structures,and the resulting material particle size is about 200 nm.The lithium-rich cathode material prepared by self-propagating combustion method has good electro-chemical performance,and the specific discharge capacity of 0.6Li2MnO3·0.4LiNi1/3Co1/3Mn1/3O2 is 255 mAh/g.Under the charge and discharge conditions of 2.3～4.8 V and 0.1 C,the capacity retention rate reaches 84％after 100 cycles.
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