An electrochemical impedance spectroscopy study of new lithiated manganese oxides for 3 V application in rechargeable Li-batteries

  • Franger S
  • Bach S
  • Farcy J
 et al. 
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The main electrochemical properties of 3 V manganese oxides Li0.45MnO2.1and Li0.45Mn0.85Co0.15O2.3synthesized via a solution technique are reported. These materials are characterized by an attractive cycle life with a stable specific capacity in the voltage range 4.2-2 V between 165 and 195 mAh g-1depending the C rate and the compound. Impedance spectroscopy is used to evaluate the chemical diffusion coefficient of lithium in both cathodic materials. DLiis found to be twofold higher in the Co-doped compound and little affected by Li concentration in the composition range 0.45 < x < 0.85. Analysis of impedance diagrams supports the existence of a passivating layer (Li+-ion conducting layer) onto the electrode when propylene carbonate is used as solvent or cosolvent. The presence of cobalt promotes the formation of this surface layer. © 2002 Elsevier Science Ltd. All rights reserved.

Author-supplied keywords

  • Impedance spectroscopy
  • Lithium batteries
  • Manganese oxides
  • Passivating film

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  • Sylvain FRANGERUniversite Paris-Sud Faculte des Sciences d'Orsay

  • S. Bach

  • J. Farcy

  • J. P. Pereira-Ramos

  • N. Baffier

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