Sol-gel synthesis of LiMn2O4 and relationship between extraction-insertion of lithium ion and structure

Normal spinet LiMn2O4 was synthesized by sot-gel method. The structure, characteristics and the optimum conditions were studied. The results show that the proportioning of raw materials and the calcining temperature of dried gel affected markedly the composition, structure and micrograph of products. Further research indicate that high pure lambda-MnO2 was prepared by leaching LiMn2O4 in 1 mol(.)L(-1) HCl for 120 h. Solid solution Li1.01Mn2O4 was obtained after lambda-MnO2 adsorbed lithium ion. The extraction and insertion of lithium ion were reversible in structure. The formation of solid solution Li1.01Mn2O4 has great significance for improvement of ion-sieve property.