Nanoscale Research Letters (Jan 2009)
LiMn<sub>2</sub>O<sub>4–<it>y</it> </sub>Br<sub> <it>y</it> </sub>Nanoparticles Synthesized by a Room Temperature Solid-State Coordination Method
Abstract
Abstract 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 °C and the content of Br−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−in LiMn2O4is quite effective in improving the initial discharge capacity.
