Nanostructured LiNi1/3Co1/3Mn1/3O2 powders were successfully synthesized via an ultrasonic spray pyrolysis process. The prepared powders were composed of nanosized crystallites and formed a spherical shape. Well-crystallized structure was obtained after calcination at 800 °C. The prepared LiNi1/3Co1/3Mn1/3O2 powders exhibited a high discharge capacity of 184 mAh/g within the voltage range of 2.5–4.5 V. The capacity retention was 78% after 100 cycles test at 1C charging and 3C discharging rate at 55 °C.
The Mg–Li alloys with Li content of 5–11 mass- will exhibit a dual phase structure of α (hcp) and β (bcc) phases. These dual phase Mg–Li alloys have excellent formability, as well as extra low density. However, the Mg–Li alloys still have disadvantages of poor corrosion and wear resistance. In the present study, the AlN films deposited on Mg–Li alloy by radio frequency magnetron sputtering were investigated. The microstructure, surface morphology and corrosion resistance of the AlN films were examined by means of X-ray diffraction, SEM, TEM, and potentiodynamic polarisation. Experimental results show that deposited AlN films exhibit an amorphous structure, which can effectively improve the corrosion resistance of Mg–Li alloy. Meanwhile, the sputtering parameters, such as the radiofrequency power and working pressure, are found to have significant effects on the corrosion behaviour of deposited AlN films on Mg–Li alloy.
For the first time, modification of Si doping in Hf-silicates with respect to thermal budget is investigated. Tetragonal phase of HfO2 in Hf-silicate leads to higher dielectric constant after a critical point of thermal budget. Lower critical point (lower thermal budget) is needed for Hf-silicate with a lower Si doping. The tetragonal phase induced higher dielectric constant tends to remain constant even with longer annealing time while the leakage current tends to increase. The optimum condition is a trade-off between the pro of tetragonal phase and the con of the leakage current.
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