Dyah Purwaningsih, Roto Roto, Hari Sutrisno, Agus Purwanto
Transition metal-doped spinel cathode materials of LiM0.1Mn1.9O4 (M: Co, Ni, Cr) were prepared by solid-state reaction. The structure and morphology of the products were investigated by X-ray photoelectron spectroscopy, X-ray diffraction, Rietveld refinement and SEM-EDX. The oxidation states of Mn, Co, Ni and Cr were found to be 3+/4+, 2+, 2+ and 3+, respectively as revealed by X-ray photoelectron spectroscopy. SEM-EDX shows uniform particles and the particle size was about 200-700 nm ranges. The diffraction peaks of the prepared solids corresponded to a single phase of cubic spinel structure with a space group Fd3m. Doping of Co, Ni and Cr causes lattice parameters to decrease. The prepared materials have ionic conductivity where LiCo0.10Mn1.90O4 has the highest capacitance.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, Indonesia; Department of Chemistry Education, Faculty of Mathematics and Natural Sciences, Yogyakarta State University, Yogyakarta, Indonesia; Department of Chemical Engineering, Faculty of Engineering, Universitas Sebelas Maret, Surakarta, Indonesia
