Abstract
Polycrystalline LiNi0.8Co0.2O2 powders were synthesized via the citric acid-assisted liquid phase evaporation method. The precursors are homogenously mixed in the solutions at an atomic scale which is also reflected by the particle distribution of the final products. The optimal synthesis temperature is located at 750 °C where the particle size, crystalline structure, and the cation disorder between Li+ and Ni2+ ions have been balanced. A high discharge capacity of 191 mAh g–1 (3.0–4.3 V at 30 mA/g) is achieved in the first cycle for the 750 °C-prepared sample with a capacity retention of 89.37% after 96 cycles. Cyclic voltammetry and the differential capacity curves also reveal a moderate stable crystal structure of 750 °C-prepared LiNi0.8Co0.2O2 during the prolonged cycles.
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