One-Spot Facile Synthesis of Single-Crystal LiNi(0.5)Co(0.2)Mn(0.3)O(2) Cathode Materials for Li-ion Batteries

[Image: see text] The layered lithium-metal oxides are promising cathode materials for Li-ion batteries. Nevertheless, their widespread applications have been limited by the high cost, complex process, and poor stability resulting from the Ni(2+)/Li(+) mixing. Hence, we have developed a facile one-spot method combining glucose and urea to form a deep eutectic solvent, which could lead to the homogeneous distribution and uniform mixing of transition-metal ions at the atomic level. LiNi(0.5)Co(0.2)Mn(0.3)O(2) (NCM523) polyhedron with high homogeneity could be obtained through in situ chelating Ni(2+), Co(3+), and Mn(4+) by the amid groups. The prepared material exhibits a relatively high initial electrochemical property, which is due to the unique single-crystal hierarchical porous nano/microstructure, the polyhedron with exposed active surfaces, and the negligible Ni(2+)/Li(+) mixing level. This one-spot approach could be expanded to manufacture other hybrid transition-metal-based cathode materials for batteries.