Exploration of layered-type pseudo four-component Li-Ni-Co-Ti oxides

摘要

A series of layered-type pseudo four-component Li-Ni-Co-Ti oxides were prepared to explore optimal cathode materials for a lithium-ion secondary battery. The new layered-type compounds were prepared using a combinatorial material-preparation system based on electrostatic spray deposition (the "M-ist Combi" system), and combinatorial powder X-ray diffraction. The composition region of the new compounds (Li_α(Ni_x-Co_yTi_z)O_2 (α～l, 0 ≤x ≤1, 0≤ y ≤ 1, z～0.2, x + y + z- 1.0)) was found to be wider than the composition region previously reported (LiNi_(0.8-y)Co_(0.2)Ti_yO_2 (0 ≤ y ≤ 0.1)).