Electrochemical performances of LiNiO2 substituted by Ti for Ni via the combustion method

LiNiO2 and LiNi0.990Ti0.010O2 samples were synthesized using the combustion method. The starting materials, in desired proportions, were dissolved in distilled water and mixed with urea using a magnetic stirrer. The mixture was calcined at 750 °C for 36 h in an O2 stream after preheating at 400 °C for 30 min in air. The electrochemical performances of the synthesized samples were then investigated. LiNi0.990Ti0.010O2 had a larger first discharge capacity of 203 mA h/g and a larger discharge capacity at n (number of cycles)=50 of 140 mA h/g than LiNiO2. It showed a cycling performance, which is not bad, with a discharge capacity degradation rate of 1.09 mA h/g/cycle. LiNiO2 had a smaller first discharge capacity of 158 mA h/g but a better cycling performance than LiNi0.990Ti0.010O2 with the discharge capacity degradation rate of 0.45 A h/g/cycle.