LiMn(2)O(4-y)Br(y) Nanoparticles Synthesized by a Room Temperature Solid-State Coordination Method

LiMn(2)O(4-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 LiMn(2)O(4-y)Br(y) powders were well-crystallized pure spinel phase. Transmission electron microscopy images showed that the LiMn(2)O(4-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 LiMn(2)O(4-y)Br(y) with the best electrochemical performances. The optimized synthesis condition was found in this work; the calcination temperature is 800 degrees C and the content of Br(-) is 0.05. The initial discharge capacity of LiMn(2)O(3.95)Br(0.05) obtained from the optimized synthesis condition was 134 mAh/g, which is far higher than that of pure LiMn(2)O(4), indicating introduction of Br(-) in LiMn(2)O(4) is quite effective in improving the initial discharge capacity.