LiMn2O4-y Br y Nanoparticles Synthesized by a Room Temperature Solid-State Coordination Method

LiMn2O4-y Br (y) nanoparticles were synthesized successfully for the first time by a room temperature solid-state coordination method. X-ray diffractometry patterns indicated that the LiMn2O4-y Br (y) powders were well-crystallized pure spinel phase. Transmission electron microscopy images showed that the LiMn2O4-y Br (y) powders consisted of small and uniform nanosized particles. Synthesis conditions such as the calcination temperature and the content of Br- were investigated to optimize the ideal condition for preparing LiMn2O4-y Br (y) with the best electrochemical performances. The optimized synthesis condition was found in this work; the calcination temperature is 800 A degrees C and the content of Br- is 0.05. The initial discharge capacity of LiMn2O3.95Br0.05 obtained from the optimized synthesis condition was 134 mAh/g, which is far higher than that of pure LiMn2O4, indicating introduction of Br- in LiMn2O4 is quite effective in improving the initial discharge capacity.