Synthesis of high-voltage spinel LiNi0.5Mn1.5O4 material for lithium-ion batteries by a metal-cholate supramolecular hydrogel as precursor

摘要

High-voltage cathode material LiNi0.5Mn1.5O4 has been first synthesized by a novel metal-cholated supramolecular hydrogel as precursor. The structural analysis was investigated by X-ray powder diffraction, scanning electronic microscope, and Fourier transform infrared spectroscopy. The results indicated that the as-products possessed well constructed spinel structure and high crystallinity and pure phase through adding optimal amount of cholic acid. The electrochemical properties were also investigated, and its results showed that the LiNi0.5Mn1.5O4 material exhibited enhanced rate capacity and cycling properties as electrode materials in lithium cells mainly due to the improved crystallinity and higher pure phase. In a word, this new approach provides an alternative and promising route for the fabrication of cathode materials with perfect octahedron structure and excellent electrochemical properties using metal-driven hydrogels as template.