Preparation of submicrocrystal LiMn₂O₄ used Mn₃O₄ as precursor and its electrochemical performance for lithium ion battery

Spinel LiMn₂O₄ has been synthesized by solid state reaction with industrial grade Mn₃O₄ and Li₂CO₃ as precursors without purification, and its electrochemical performance for lithium ion battery has been investigated by CR2025 coin cell. The results of X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images show that the size of LiMn₂O₄ particles grow up with increasing temperature of calcination, and the sample synthesized at 800°C for 12 h has the best crystallinity with a submicron size. It can deliver initial capacity of 112.9 mA h/g with capacity retention ratio of 89.1% after 200 cycles at charge/discharge rate of 1 C. The results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) also show that it has the highest electrochemical activity and lowest charge transfer impedance.