Abstract
V5+ and Cr6+ double doped nano lithium manganese oxide spinels Li[VxCrxMn2-2X]O-4, (x=0.00, 0.02, 0.05 %)] were synthesized by doping the pure spinel LiMn2O4 with vanadium and chromium ions as cathode materials for rechargeable batteries applications. These cathode materials were characterized by thermal gravimetric and differential thermal analysis (TG/DTA), x-ray powder diffractometry (XRD), scanning electron microscopy (SEM) and infrared spectroscopy (IR) measurements. XRD and SEM studies confirmed the nano materials size for all prepared spinels. LiMn2O4 and Li[V0.05Cr0.05Mn1.9]O-4 spinels were irradiated by gamma-irradiation (10 and 30 kGy). Direct-current (DC) electrical conductivity measurements indicated that these samples are semiconducting and their conductivity was strongly affected by the dopant cations and gamma-irradiation.