Electrode Property of Spinel-type LiNi_0.5Mn_1.5−<i>_x</i>Ti<i>_x</i>O₄ (0 ≤ <i>x</i> ≤ 1.5) Prepared by Electrostatic Spray Deposition

Abstract

Spinel-type LiNi 0.5 Mn 1.5−x Ti x O 4 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 0.5 Mn 1.5−x Ti x O 4 (0 ≤ x ≤ 0.5) prepared showed multi-phases of spinel, a slight amount of rock-salt-type Li y Ni 1−y O. In first charge-discharge capacities of LiNi 0.5 Mn 1.5−x Ti x O 4 (0 ≤ x ≤ 0.5) at current rates of 0.1 C and 1 C, LiNi 0.5 Mn 1.5 O 4 (x = 0) and LiNi 0.5 Mn 1.4 Ti 0.1 O 4 (x = 0.1) each showed a discharge capacity of about 100 mAh/g. LiNi 0.5 Mn 1.4 Ti 0.1 O 4 was also found to retain its discharge capacity at a higher rate than LiNi 0.5 Mn 1.5 O 4 . The charge-discharge capacities were lower than those observed in the previous report, however, because the powders obtained included Li y Ni 1−y O type oxides as a second phase. Also, it was found that the decrease of rock-salt phase (Li y Ni 1−y O) was able to control by changing the atmospheric and powder shape-forming conditions. KEY WORDSspinel-type compounds, electrode materials, lithium ion secondary battery, electrostatic spray deposition method

Mapping of Phase Diagram and Electrode Properties in Spinel-type LiNi_<i>x</i>Mn_{2-<i>x</i>-<i>y</i>}Ti_<i>y</i>O₄ Cathodes for Lithium-Ion Batteries

“…Our group has synthesized the spinel-type LiNi0.5Mn1.5-yTiyO4 (0 ≤ y ≤ 1.5) system by electrostatic spray deposition, optimized the synthesis conditions and investigated their electrode properties. 15 In this study, extending further composition range, we constructed a reaction diagram for the LiNi2Ox-LiMn2O4-LiTi2Ox system by the combinatorial high-throughput materials exploration system based on the electrostatic spray deposition method (M-ist Combi 16 ). In addition, their discharge capacity and cycling performance were investigated and mapped in the region where the spinel phase was obtained.…”