Synthesis of spinel LiNi0.5Mn1.5O4 by a wet chemical method and characterization for lithium-ion secondary batteries

Abstract

5V cathode material LiNi0.5Mn1.5O4 was synthetized by a simple wet chemical reaction using acetates as precursor's materials. Cathode active materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Inductively Coupled Plasma (ICP). Electrochemical properties of active materials were evaluated through chargedischarge tests with operation voltage between 3.5 to 4.9V at 0.3 C. The synthetized sample with high amount of Mn/Ni precursor (LMNO-1) shows a higher first discharge capacity but a faster degradation after 3 cycles. This behavior should be due to the lack of Mn substitute by Ni and therefore more significant JahnTeller effect as shown by Raman, ICP and XPS results.