Electrochemical properties of nanocrystalline LiFexMn2-xO4 (x=0.2-1.0) cathode particles prepared by ultrasonic spray pyrolysis method


EBIN B., Gürmen S. , Arslan C. , Lindbergh G.

ELECTROCHIMICA ACTA, vol.76, pp.368-374, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76
  • Publication Date: 2012
  • Doi Number: 10.1016/j.electacta.2012.05.052
  • Title of Journal : ELECTROCHIMICA ACTA
  • Page Numbers: pp.368-374

Abstract

The nanocrystalline LiFexMn(2-x)O(4) (x=0.2-1.0) particles were prepared by ultrasonic spray pyrolysis method using nitrate salts of ingredients at 800 degrees C in air atmosphere. Particle properties were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy. Besides, cyclic voltammetry and galvanostatic tests were performed to investigate the effects of the iron substituent amount on electrochemical behavior. Particle characterization studies show that nanocrystalline particles have spinel structure and they are in submicron size range with spherical morphology. The lowest iron doped sample (LiFe0.2Mn1.8O4) exhibits 117 mAh g(-1) cumulative discharge capacity at 0.5C and 88% capacity retention for 4 V plateau after 50 cycles. At higher iron concentrations, substituent tends to occupy the 8a tetrahedral sites, which prevent the lithium transport in the lattice during charge-discharge process. Increasing of the iron amount in the spinet structure causes the deterioration of the electrochemical performance. (C) 2012 Elsevier Ltd. All rights reserved.