Synthesis and electrochemical properties of nanostructured LiAlxMn2-xO4-yBry particles

Nanostructured LiAlxMn2-xO4-yBry particles were synthesized successfully by annealing the mixed precursors, which were prepared by room-temperature solid-state coordination method using lithium acetate, manganese acetate, lithium bromide, aluminum nitrate, citric acid, and polyethylene glycol 400 as starting materials. X-ray diffractometer patterns indicated that the particles of the as-synthesized samples are well-crystallized pure spinel phase. Transmission electron microscopy images showed that the LiAlxMn2-xO4-yBry samples consist of small-sized nanoparticles. The results of galvanostatic cycling tests revealed that the initial discharge capacity of LiAl0.05 Mn1.95O3.95Br0.05 is 119 mAh g(-1); after the 100th cycle, its discharge capacity still remains at 92 mAh g(-1). The introduction of Al and Br in LiMn2O4 bring a synergetic effect and is quite effective in increasing the capacity and elevating cycling performance.