Synthesis And Electrochemical Performance Of Li₄Mn₅O₁₂

Li4MnsO12 can be inserted and deinserted lithium ion in extensive compose range, with the theory capacity of 163mAh/g. During charge-discharge cycle, the expandability of Li4Mn5O12 lattice is lower than other manganese oxides, thus the cycling performance is excellent with the high capacity utility efficiency. The problem is that it is difficult to synthesize pure Li4Mn5O12. In allusion to those, the different synthesis condition were studied ,such as different raw material proportion, sinter mode, temperature and so on. The as-synthesized samples were systemically measured by many modern experimental techniques such as the X-ray powder diffraction (XRD), Forier transform infrared spectroscopy (FT-IR), Cyclic voltammogram (CV), Scanning electron microscope (SEM), Thermogravimetric analysis-differential thermal analysis (TGA-DTA) charge-discharge and storage performance. Then the preparation condition is established. The optimized synthesis condition is that the precursor which using citric acid and EDTA as chelator. Was sintered by microwave pretreatment associating with low-temperature solid sintering, The Li4Mn5O12 with favourable electrochemical performance is synthesized in low-temperature sintering. The particle size is between 0.3-0.4 m, and it has excellent thermal stabilization performance at 20-700 C. During charge/discharge in both big current and little current, the sample has 155mAh/g discharge capacity after 38 cycles, and its storable performance is very well.