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A novel finding, that solid octahedral NiO micro-particles can be prepared via an ionic liquid (IL)present calcination method using nickel acetate as the starting material, was reported for the first time in this communication. In the absence of IL, NiO particles with a porous cauliflower-like morphology were produced. The crystal structure and the morphologies of all synthesized samples were respectively characterized by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The formation of NiO phase in sample a was further verified via HRTEM and XPS. Also, it was revealed by the galvanostatic charge-discharge measurement that the initial discharge capacity of the solid octahedral NiO micro-particles was 757.3 mAh g at 100 mA g, much larger than that of sample b (436.3 mAh g). And even after 50 cycles, the discharge capacities of all prepared samples were all maintained higher than 210 mAh g at 100 mA g. The successful preparation of solid octahedral NiO micro-particles was very favorable not only for the development of lithium ions anode materials but also for the exploration of micro-scale devices.

international journal of electrochemical science

Solid octahedral NiO micro-particles prepared by a calcination method in the presence of an ionic liquid and their application as anode for lithium ion batteries