Electrode Property of Spinel-type LiNi_0.5Mn_1.5−xTi_xO₄ (0 ≤ x ≤ 1.5) Prepared by Electrostatic Spray Deposition

Abstract

Spinel-type LiNi_0.5Mn_1.5−xTi_xO₄ powder library was prepared using the electrostatic spray deposition (ESD) method. Deposited powder was heat-treated at 700 °C for 3 hours in air. Phase identification of the X-ray diffraction patterns of the LiNi_0.5Mn_1.5−xTi_xO₄ (0 ≤ x ≤ 0.5) prepared showed multi-phases of spinel, a slight amount of rock-salt-type Li_yNi_1−yO. In first charge-discharge capacities of LiNi_0.5Mn_1.5−xTi_xO₄ (0 ≤ x ≤ 0.5) at current rates of 0.1 C and 1 C, LiNi_0.5Mn_1.5O₄ (x = 0) and LiNi_0.5Mn_1.4Ti_0.1O₄ (x = 0.1) each showed a discharge capacity of about 100 mAh/g. LiNi_0.5Mn_1.4Ti_0.1O₄ was also found to retain its discharge capacity at a higher rate than LiNi_0.5Mn_1.5O₄. The charge-discharge capacities were lower than those observed in the previous report, however, because the powders obtained included Li_yNi_1−yO type oxides as a second phase. Also, it was found that the decrease of rock-salt phase (Li_yNi_1−yO) was able to control by changing the atmospheric and powder shape-forming conditions.