Synthesis, electrochemical, and structural properties of LiNi0.8Co0.15Al0.05O2 cathodes prepared by TiO2 nanoparticles coating on a Ni0.8Co0.15Al0.05(OH)2 precursor have been investigated by the variation of coating concentration and annealing temperature. TiO2-coated cathodes showed that Ti elements were distributed throughout the particles. Among the coated cathodes, the 0.6wt% TiO2-coated cathode prepared by annealing at 750°C for 20h exhibited the highest reversible capacity of 176mAhg−1 and capacity retention of 92% after 40 cycles at a rate of 1C (=190mAg−1). On the other hand, an uncoated cathode showed a reversible first discharge capacity of 186mAhg−1 and the same capacity retention value to the TiO2-coated sample at a 1C rate. However, under a 1C rate cycling at 60°C for 30 cycles, the uncoated sample showed a reversible capacity of 40mAhg−1, while a TiO2-coated one showed 71mAhg−1. This significant improvement of the coated sample was due to the formation of a possible solid solution between TiO2 and LiNi0.8Co0.15Al0.05O2. This effect was more evident upon annealing the charged sample while increasing the annealing temperature, and at 400°C, the coated one showed a more suppressed formation of the NiO phase from the spinel LiNi2O4 phase than the uncoated sample.