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 °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.