NOVEL LOW-TEMPERATURE SYNTHESIS AND CHARACTERIZATION OF LINIVO4 FOR HIGH-VOLTAGE LI ION BATTERIES

A novel high-voltage cathode material, LiNiVO4, with an inverse spinel structure, space group, Fd (3) over bar m (O-h(7)) has been synthesiz ed at temperatures as low as 320 degrees C using the aqueous glycine-n itrate combustion process. The phase purity of the synthesized product has been found to be excellent as confirmed by X-ray diffraction and Raman spectroscopy. The physical grain size has been determined from S EM analysis. EDAX measurements indicate the presence of nickel and van adium at the stoichiometric level. Thermal studies of the precursor sh ow evidence for the phase formation and/or crystallization of the inve rse spinel compound. The electrochemical behaviour of this compound, w hich is used as a positive electrode in lithium batteries, exhibits a high voltage of 4.8 V vs. Li and has been assessed by slow scan cyclic voltammetry in 2450 coin-type electrochemical lest cells including a Li metal anode or a carbonaceous anode as well as a high voltage resis tant organic non-aqueous mixed electrolyte. The cyclic voltammograms s how excellent reversibility of the compound, proving its redox kinetic s in lithium-containing rechargeable cells.