Structural and Electrochemical Properties of the High Ni Content Spinel LiNiMnO4

This work presents a contribution to the study of new Ni-rich spinel cathode material, LiNiMnO4, for Li-ion batteries operating in 5-V region. The LiNiMnO4 compound was synthesized by sol-gel method assisted ethylene diamine tetra-acetic acid (EDTA) as chelator. Structural analyses carried out Rietveld refinements and Raman spectroscopy, selected area electron diffraction (SAED) X-ray photoelectron (XPS) spectroscopy reveal that product is composite (LNM@NMO), including non-stoichiometric LiNiMnO4-? secondary Ni6MnO8 cubic phase. Cyclic voltammetry galvanostatic charge-discharge profiles show similar features those LiNi0.5Mn1.5O4 bare. A comparison electrochemical performances 4-V LiMn2O4 with LNM@NMO demonstrates long-term cycling stability this cathode. Due presence phase, electrode exhibits an initial specific capacity low 57 mAh g?1 but shows excellent at 1C rate 1000 cycles decay 2.7 × 10?3 per cycle.