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Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy

Mirzaeian, Mojtaba and Hall, Peter J. (2010) Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy. Journal of Power Sources, 195 (19). pp. 6817-6824. ISSN 0378-7753

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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.

Item type: Article
ID code: 31661
Keywords: lithium oxygen battery, carbon aerogel, charge-discharge cycling, discharge capacity, electrochemical impedance spectroscopy, polymers, carbon aerogels, intercalation, cathodes, porosity, Chemical engineering, Energy Engineering and Power Technology, Physical and Theoretical Chemistry, Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment
Subjects: Technology > Chemical engineering
Department: Faculty of Engineering > Chemical and Process Engineering
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 15 Jun 2011 14:32
Last modified: 27 Jun 2014 05:07
URI: http://strathprints.strath.ac.uk/id/eprint/31661

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