Discharge capacity of composite of LiF and Li(20%)-doped NiO is mechanical milling of LiF and Li-doped NiO (d_NiO) for -1 247 mAh g . 72 h. Li-d_NiO is prepared by the calcination of a mixture of Li CO and NiO. The X-ray diffraction peaks of NiO are 2 3 shifted by the doping and milling processes, while those of LiF disappear after milling. Rietveld analysis shows that the composites obtained by milling form solid solutions ? 2? and that the Li and Ni ions in them are disordered. LiF and Li-d_NiO samples milled individually do not exhibit a noticeable discharge capacity, while the composites show large values. The composite formed using undoped NiO without ball-milling shows a discharge capacity of -1 144 mA h g at 0.05 C between 2.0 and 5.0 V, while the composite of LiF and 20% Li-d_NiO exhibits a discharge -1 capacity of 247 mA h g . The rate capabilities of the composites increase with the Li content, and the discharge -1 capacity of the LiF–Li-d_NiO (20%) is 146 mA h g at 1 C for voltages of 2.0–4.8 V. Keywords Cathode materials Lithium-ion secondary battery Mechanical milling Solid solutions
Journal of Applied Electrochemistry – Springer Journals
Published: Jul 3, 2017
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