文摘
A hierarchical porous nickel-rich LiNi0.6Co0.2Mn0.2O2 cathode is successfully prepared for the first time using a facile ammonia-induced method, wherein ammonia molecules play a key role in fabricating the complex architecture, and neither templates nor precipitants are employed. Hierarchical flower-like precursor with ultra-thin nanosheets is formed during the ammonia-induced reaction, and then, the porous product is obtained during the sintering process. The X-ray diffraction pattern demonstrates that the sample has a well-defined α-NaFeO2 structure with very low-cation disorder. The peculiar hierarchical porous morphology and ideal structure endow this material-enhanced electrochemical performance. It delivers discharge capacities of 173, 138, 111, 97, and 82 mAh g−1 at 0.1 C, 1 C, 5 C, 10 C, and 20 C, respectively, and maintains 91 % of its initial discharge capacity after 100 cycles at 1 C. The results reveal that this method is facile and feasible to synthesize high-rate Nickel-rich material.
