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, Cairo 11412, Egypt
e-mail: ayshenouda@yahoo.com

M. M. S. Sanad

Central Metallurgical Research and
Development Institute (CMRDI),
Tebbin, P.O. Box 87,
Helwan, Cairo 11412, Egypt

Manuscript received January 5, 2017; final manuscript received March 19, 2017; published online May 9, 2017. Assoc. Editor: Kevin Huang.

J. Electrochem. En. Conv. Stor. 14(2), 024501 (May 09, 2017) (5 pages) Paper No: JEECS-17-1005; doi: 10.1115/1.4036318 History: Received January 05, 2017; Revised March 19, 2017

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. Scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) investigations were carried out explaining the morphology and function groups of the synthesized samples. Furthermore, electrochemical impedance spectra (EIS) 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 mAh g−1 at 0.1 C rate. The cycle life performance of all Li2NixFe1−xSiO4 batteries was ranged between 100 and 156 mAh g−1 with coulombic efficiency range between 70.9% and 93.9%.

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Fig. 1

(a) XRD patterns of Li2NixFe1−xSiO4 samples prepared at 800 °C and (b) FTIR spectra of the as-prepared Li2FeSiO4 and Li2NiSiO4 samples

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Fig. 2

SEM of Li2NixFe1−xSiO4 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) samples prepared at 800 °C

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Fig. 3

(a) Voltage-capacity profiles for Li/Li2NixFe1−xSiO4 batteries, Nyqiust plots of Li/Li2NixFe1−xSiO4 discharged batteries after 100 cycles at (b) x = 0 and 1, (c) x = 0.2 and 0.4, and (d) x = 0.6 and 0.8

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Fig. 4

Relationship between real impedance with the low angular frequencies for (a) Li/Li2FeSiO4 and Li/Li2NiSiO4 batteries, (b) Li/ Li2NixFe1−xSiO4 (x = 0.2, 0.4, 0.6, and 0.8) batteries, and (c) cycle life performance of all Li/Li2NixFe1−xSiO4 batteries




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