Synthesis of Single-Crystalline LiMn₂O₄ with Different Dimensional Nanostructures for Li-ion Batteries

摘要

The powders of single-crystalline LiMn2O4 with different dimensional nanostructures weresynthesized. The effect of nanostructure on the electrochemical properties of LiMn2O4 cathode wasalso investigated by controlling the nanostructure of LiMn2O4, consisting of one-dimensional (1-D)nanorods with the diameter of 100 nm and length of 1.6 m, of two-dimensional (2-D) nanoplates withthe diameter ranging from 300 to 400 nm and a thickness of 20 nm, and of three-dimensional (3-D)octahedral single-crystals with edge length of 1 m. It was found that the 1-D LiMn2O4 performed the-1 best electrochemical properties with a high discharge capacity of 123.4 mAhg , a stable cyclic-1 retention, and an excellent rate capability (107.6 mAhg at 10 C, 89.3% of 0.5 C-rate dischargecapacity). Electrochemical impedance spectroscopy testing revealed the improved electrochemicalperformance, which could be considered that the nanostructure can reduce the impedance by+ enhancing the reaction area and lengthening the Li diffusion length.