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Technical Brief

Electrochemical Performance Optimization of Li2NixFe1-xSiO4 cathode materials for Lithium Ion Batteries

[+] Author and Article Information
Atef Y. Shenouda

Central Metallurgical Research and Development Institute (CMRDI), Tebbin, P.O. Box 87 Helwan, Egypt
ayshenouda@yahoo.com

Mustafa M. S. Sanad

Central Metallurgical Research and Development Institute (CMRDI), Tebbin, P.O. Box 87 Helwan, Egypt
mustafa_sanad2002@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4036318 History: Received January 05, 2017; Revised March 19, 2017

Abstract

Li2NixFe1-xSiO4 (x= 0, 0.2, 0.4, 0.6, 0.8 and 1) samples were prepared by sol-gel process. The crystal structure of prepared samples of Li2NixFe1-xSiO4 was characterized by XRD. The different crystallographic parameters such as crystallite size and lattice cell parameters have been calculated. SEM and FT-IR investigations were carried out explaining the morphology and function groups of the synthesized samples. Furthermore, electrochemical impedance spectra measurements are applied. The obtained results indicated that the highest conductivity is achieved for Li2Ni0.4Fe0.6SiO4 electrode compound. It was observed that Li/Li2Ni0.4Fe0.6SiO4 battery has initial discharge capacity of 164 mAhg-1 at 0.1 C rate. The cycle life performance of all Li2NixFe1-xSiO4 batteries were ranged between 100 and 156 mAhg-1 with coulombic efficiency range between 70.9 and 93.9%. Keywords: Positive electrodes; Lithium metal silicates; electrical conductivity; Cyclic performance.

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