Electrical, electrochemical, and cycling studies of high-power layered Li(Li < inf > 0.05 < /inf > Ni < inf > 0.7 − x < /inf > Mn < inf > 0.25 < /inf > Co < inf > x < /inf > )O < inf > 2 < /inf > (x = 0, 0.1, 0.3, 0.5, and 0.7) cathode materials for rechargeable lithium ion batteries

Abstract

The enriched lithium ion containing layered oxide cathode materials Li(Li0.05Ni0.7 − xMn0.25Cox)O2 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 − xMn0.25Cox)O2 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. [Figure not available: see fulltext.].