Preparation and electrochemical properties of spinel LiFe xCuyMn1.2O4 by ultrasonic spray pyrolysis

Burçak Ebin, Sebahattin Gürmen*, Göran Lindbergh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Nanocrystalline LiFexCuyMn1.2O4 (x and y=0.2, 0.4 and 0.6) particles were prepared by the ultrasonic spray pyrolysis method using nitrate salts at 800 C in air atmosphere. Particle properties were characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. Also, cyclic voltammetry and galvanostatic tests were performed to investigate the effects of the double substituent and doping amounts on electrochemical behavior. Results show that the aggregation of nanocrystallites around 90 nm size formed submicron spherical cathode particles. Transition metal ratios in particles exhibited a perfect fit with desired amounts. Although the change of iron and copper amounts do not show significant differences in the particle size and shape morphology, they modify the 4 V and 3 V potential plateaus of spinel LiMn2O 4. The discharge capacities of LiFe0.2Cu 0.6Mn1.2O4 particles are 39 and 23 mAh g -1 for 4 and 2.6 V potential regions, respectively. 4 V discharge capacity disappeared with increasing of iron and decreasing of copper contents due to random occupation of iron and copper ions in the spinel lattice.

Original languageEnglish
Pages (from-to)1019-1027
Number of pages9
JournalCeramics International
Volume40
Issue number1 PART A
DOIs
Publication statusPublished - Jan 2014

Keywords

  • Cathode particles
  • Li-ion batteries
  • Nanostructures
  • Spinel structure
  • Ultrasonic spray pyrolysis

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