Nano Express
LiMn2O4–y Br y Nanoparticles Synthesized by a Room Temperature Solid-State Coordination Method
1 Institute of Applied Chemistry, Xinjiang University, Urumqi, 830046, People’s Republic of China
2 School of Science, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China
Nanoscale Research Letters 2009, 4:353-358 doi:10.1007/s11671-009-9252-7
Published: 22 January 2009Abstract
LiMn2O4–yBrynanoparticles were synthesized successfully for the first time by a room temperature solid-state coordination method. X-ray diffractometry patterns indicated that the LiMn2O4–yBrypowders were well-crystallized pure spinel phase. Transmission electron microscopy images showed that the LiMn2O4–yBrypowders 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–yBrywith 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.
