Temperature and potential dependence electrochemical impedance studies of LiMn2O4

Kumar, Surender and Nayak, Prasant Kumar and Hariharan, Krishnan S and Munichandraiah, N (2014) Temperature and potential dependence electrochemical impedance studies of LiMn2O4. In: JOURNAL OF APPLIED ELECTROCHEMISTRY, 44 (1). pp. 61-71.

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Abstract

Detailed analysis of alternating current impedance data of LiMn2O4 electrodes measured at several temperatures and potentials was carried out. The Nyquist plots generally consisted of semicircles corresponding to two time constants. However, at low temperatures (-10 to 10 A degrees C) and potential region between 3.90 and 4.20 V, three time constants were present. The third semicircle present at the middle to high frequency range was attributed to electronic resistance of LiMn2O4. Impedance parameters were evaluated using appropriate electrical equivalent circuits. From the temperature dependence of resistive parameters, activation energy values for the corresponding processes were calculated.

Item Type:	Journal Article
Publication:	JOURNAL OF APPLIED ELECTROCHEMISTRY
Publisher:	SPRINGER
Additional Information:	Copyright for this article belongs to the SPRINGER, NETHERLANDS
Keywords:	Lithium-ion battery; Cathode material; Impedance; Electronic resistance; Activation energy
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	12 Feb 2014 11:15
Last Modified:	12 Feb 2014 11:15
URI:	http://eprints.iisc.ac.in/id/eprint/48368

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