Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy


Autoria(s): Mirzaeian, Mojtaba
Data(s)

01/10/2010

Resumo

Polymer based carbon aerogels were prepared by synthesis of a resorcinol formaldehyde gel followed by pyrolysis at 1073K 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/O2 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/O2 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.

Identificador

http://pure.qub.ac.uk/portal/en/publications/characterizing-capacity-loss-of-lithium-oxygen-batteries-by-impedance-spectroscopy(01ce677e-9ab7-4c40-a572-7ed5f6b32780).html

http://dx.doi.org/10.1016/j.jpowsour.2010.04.064

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Mirzaeian , M 2010 , ' Characterizing capacity loss of lithium oxygen batteries by impedance spectroscopy ' Journal of Power Sources , vol 195 , no. 19 , pp. 6817-6824 . DOI: 10.1016/j.jpowsour.2010.04.064

Palavras-Chave #/dk/atira/pure/subjectarea/asjc/1600/1606 #Physical and Theoretical Chemistry #/dk/atira/pure/subjectarea/asjc/2100/2102 #Energy Engineering and Power Technology #/dk/atira/pure/subjectarea/asjc/2100/2105 #Renewable Energy, Sustainability and the Environment #/dk/atira/pure/subjectarea/asjc/2200/2208 #Electrical and Electronic Engineering
Tipo

article