Electrical, electrochemical, and cycling studies of high-power layered Li(Li0.05Ni0.7-x Mn0.25Co (x) )O-2 (x=0, 0.1, 0.3, 0.5, and 0.7) cathode materials for rechargeable lithium ion batteries

초록

The enriched lithium ion containing layered oxide cathode materials Li(Li0.05Ni0.7 - x Mn0.25Co (x) )O-2 have been prepared by using facile sol-gel technique. The phase purity and crystalline nature of the layered oxide cathodes have determined by X-ray diffraction analysis. Surface morphology and elemental analysis have been carried out using scanning electron microscopy with energy dispersive analysis by X-rays and HR-TEM. Cyclic voltammetry analysis of the lithium-enriched cathode material shows a well redox performance at electrode-electrolytic interface. The Li(Li0.05Ni0.7 - x Mn0.25Co (x) )O-2 cathode shows the most promising electrochemical properties under different conditions in which an appropriate rising of discharge capacity (i.e., 167 mAh g(-1) at 0.5 C) and cycling stability (i.e., capacity retention: 83% at 1 C after 20 cycles, cutoff voltage 2.8-4.5 V) at ambient temperature. These unique properties allow the effective use of these cathode materials as positive electrodes for the development of rechargeable lithium ion batteries.

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