Doping Effect of Fe3+ and Ni2+ Cations on Synthesis of Spinel LiM X Mn2−X O4 Cathode Active Nanoparticles for Rechargeable Li-Ion Batteries
Abstract:In this paper, metal cation doped spinel LiM x Mn2−x O4 (M:Ni2+ and Fe3+ cations) cathode active nanoparticles have been prepared by microwave hydrothermal technique using LiNO3 and Mn(CH3COO)2 aqueous solutions. As synthesized nanoparticles have been calcined at different calcination temperatures such as 500, 700 and 800 °C. The effect of Ni2+ and Fe3+ substitution on the chemical bonding nature of spinel LiMn2O4 has been investigated by performing comparative X-ray diffraction spectroscopic analyses for Ni2+ and Fe3+ substituted LiM x Mn2−x O4 compounds. Then a systematic investigation regarding the effect of calcination temperature on the morphology and structure of LiM x Mn2−x O4 nanoparticles have been performed. The morphological studies are conducted using scanning electron microscopy. However, lattice parameters, crystallite sizes and crystalline indexes have been calculated. Fine LiMn2O4 nanoparticles, less than 50 nm size, have been prepared at low calcination temperatures. Also crystals have had higher quality and well defined morphology related to the increase at calcination temperature.
Document Type: Research Article
Publication date: April 1, 2011
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