Electrochemical Conversion of $LiMn_2O_4$ to $MgMn_2O_4$ in Aqueous Electrolytes

Sinha, Nupur Nikkan and Munichandraiah, N (2008) Electrochemical Conversion of $LiMn_2O_4$ to $MgMn_2O_4$ in Aqueous Electrolytes. In: Electrochemical and Solid-State Letters, 11 (11). F23-F26.

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Abstract

It is shown that the $Li^+$ ion in $LiMn_2O_4$ can be replaced by the $Mg^{2+}$ ion, resulting in the formation of $MgMn_2O_4$ in aqueous $Mg(NO_3)_2$ electrolytes by subjecting $LiMn_2O_4$ electrodes to cyclic voltammetry. The additional electronic charge due to the $Mg^{2+}$ ion is compensated by a decrease in the average oxidation state of Mn from 3.5 in $LiMn_2O_4$ to 3.0 in $MgMn_2O_4$. Chemical analysis, powder X-ray diffraction, energy dispersive X-ray analysis and X-ray photoelectron spectroscopy studies confirm the presence of Mg in the compound. Cyclic voltammetry and chronopotentiometry studies suggest that $MgMn_2O_4$ can undergo reversible redox reaction by intercalation/deintercalation of $Mg^{2+}$ ions in aqueous $Mg(NO_3)_2$ electrolytes.

Item Type:	Journal Article
Publication:	Electrochemical and Solid-State Letters
Publisher:	The Electrochemical Society
Additional Information:	Copyright of this article belongs to The Electrochemical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	03 Nov 2008 04:56
Last Modified:	19 Sep 2010 04:51
URI:	http://eprints.iisc.ac.in/id/eprint/16290

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