Synthesis and Lithium Intercalation Properties of Nanocrystalline Lithium Iron Oxides

摘要: Lithium iron oxides Li{sub x}Fe{sub y}O{sub z} were synthesized by oxidizing Fe{sup 2+} with lithium peroxide in the presence of hydroxide aqueous solutions followed firing precursors at 200 {le} T 800 C. The samples characterized X-ray powder diffraction, transmission electron microscopy, wet-chemical analyses, and surface-area measurements. Li/Fe ratio depends on concentrations volumes reactants used synthesis. Samples fired a lower temperature C nanocrystalline microstructure optimum exhibit capacity about 140 mAh/g range 1.5--4.3 V excellent cyclability. On other hand, higher temperatures {ge} 400 well-defined crystalline phases much (< 50 mAh/g).