Solvothermal synthesis of superfine Li1-xMn2O4-sigma powders

摘要

Superfine Li1-xMn2O4-sigma powders were successfully synthesized by the alcohol-thermal method using 0.01 mol of MnO2, 0.01 mol of LiOH . H2O, and 0.06 mol of NaOH as starting materials at 160-200degreesC. The products are characterized by XRD, TEM, ED, BET, and ICP. Results show that the Li0.74Mn2O3.74 powder prepared at 200degreesC has an average size of 180 nm with BET surface areas of 16.44 M-2/g. A possible formation mechanism is proposed. It was concluded that the alcohol acts not only as the solvent but also as the reducing agent in the synthesis of Li1-x,Mn2O4-sigma powders. The effects of reaction temperature and the contents of NaOH and LiOH on the formation of single phase Li1-xMn2O4-sigma were investigated. (C) 2002 Elsevier Science. [References: 12]