LiMn₂O_{4&#8211;<it>y</it>}Br_<it>y</it>Nanoparticles Synthesized by a Room Temperature Solid-State Coordination Method

Abstract LiMn2O4&#8211;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&#8211;y Br y powders were well-crystallized pure spinel phase. Transmission electron microscopy images showed that the LiMn2O4&#8211;y Br y powders consisted of small and uniform nanosized particles. Synthesis conditions such as the calcination temperature and the content of Br&#8722;were investigated to optimize the ideal condition for preparing LiMn2O4&#8211;y Br y with the best electrochemical performances. The optimized synthesis condition was found in this work; the calcination temperature is 800 &#176;C and the content of Br&#8722;is 0.05. The initial discharge capacity of LiMn2O3.95Br0.05obtained from the optimized synthesis condition was 134 mAh/g, which is far higher than that of pure LiMn2O4, indicating introduction of Br&#8722;in LiMn2O4is quite effective in improving the initial discharge capacity.