Synthesis, characterization and optical band gap of Lithium cathode materials: Li۲Ni۸O۱۰ and LiMn۲O۴ nanoparticles

Li۲Ni۸O۱۰ and LiMn۲O۴ Nanoparticles as cathode materials of lithium ion battery, were successfully synthesized using lithium acetate, nickel and manganese acetate as Li, Ni and Mn sources and stearic acid as a complexing reagent. The structure of the obtained products were characterized by FT-IR and XRD. The shape, size and distribution of the Li۲Ni۸O۱۰ and LiMn۲O۴ nanoparticles were observed by SEM.Optical band gap and magnetic properties were determined by Diffuse Reflectance Spectroscopy (DRS) and Vibrating Sample Magnetometer (VSM). Li۲Ni۸O۱۰ and LiMn۲O۴ spinels were identified as the main crystalline phases. The particles size of both, Li۲Ni۸O۱۰ and LiMn۲O۴ nanoparticles, is around ۲۴ to ۳۲ nm. Optical band gap of Li۲Ni۸O۱۰ and LiMn۲O۴ are ۱.۴۰ eV and ۱.۱۶ eV, respectively. Therefore, lithium nickel and lithium manganese oxide nanoparticles can be used as a semiconductor materials in electrical devices. VSM curve showed paramagnetic behaviour of LiMn۲O۴ nanoparticles. Moreover, color parameters were obtained by colorimetric analysis of LiMn۲O۴ indicating characteristic values of L*=۲۵.۸۲۰, a*=۱.۶۰۷ and b*= -۱.۱۴۳.

کلیدواژه ها:

Li۲Ni۸O۱۰ ، LiMn۲O۴ ، nanoparticles ، Optical band gap ، Semiconductor