Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy

Mojtaba Mirzaeian, Peter J. Hall

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

Polymer based carbon aerogels were prepared by synthesis of a resorcinol formaldehyde gel followed by pyrolysis at 1073 K under Ar and activation of the resultant carbon under CO2 at different temperatures. The prepared carbon aerogels were used as active materials in the preparation of cathode electrodes for lithium oxygen cells and the electrochemical performance of the cells was evaluated by galvanostatic charge/discharge cycling and electrochemical impedance measurements. It was shown that the storage capacity and discharge voltage of a Li/O-2 cell strongly depend on the porous structure of the carbon used in cathode. EIS results also showed that the shape and value of the resistance in the impedance spectrum of a Li/O-2 cell are strongly affected by the porosity of carbon used in the cathode. Porosity changes due to the build up of discharge products hinder the oxygen and lithium ion transfer into the electrode, resulting in a gradual increase in the cell impedance with cycling. The discharge capacity and cycle life of the battery decrease significantly as its internal resistance increases with charge/discharge cycling.

LanguageEnglish
Pages6817-6824
Number of pages8
JournalJournal of Power Sources
Volume195
Issue number19
DOIs
Publication statusPublished - 1 Oct 2010

Fingerprint

Lithium
electric batteries
Carbon
lithium
Spectroscopy
impedance
Oxygen
carbon
oxygen
cells
cycles
Cathodes
Aerogels
spectroscopy
cathodes
aerogels
Porosity
porosity
Electrodes
electrodes

Keywords

  • lithium oxygen battery
  • carbon aerogel
  • charge-discharge cycling
  • discharge capacity
  • electrochemical impedance spectroscopy
  • polymers
  • carbon aerogels
  • intercalation
  • cathodes
  • porosity

Cite this

Mirzaeian, Mojtaba ; Hall, Peter J. / Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy. In: Journal of Power Sources. 2010 ; Vol. 195, No. 19. pp. 6817-6824.
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Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy. / Mirzaeian, Mojtaba; Hall, Peter J.

In: Journal of Power Sources, Vol. 195, No. 19, 01.10.2010, p. 6817-6824.

Research output: Contribution to journalArticle

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