Effect of various synthetic parameters on purity of LiMn2O4 spinel synthesized by a sol-gel method at low temperature

Spinel lithium manganese oxide, LiMn2O4, prepared by the sol-gel method usi ng citric acid as a chelating agent under different (i) pH conditions, (ii) molar ratio of citric acid to total metal ion, (iii) amount of water, (iv) calcination temperature, and (vi) starting materials. The effects of vario us synthetic parameters on the purity of this oxide are analysed by means o f X-ray diffraction measurements. The results show that pure LiMn2O4 can be prepared from nitrate salts as starting materials at a low temperature of 600 degreesC. The optimum pH and molar ratio of chelating agent to total me tal ions are 6.0 and 1.0, respectively. (C) 2001 Elsevier Science B.V. All rights reserved.