Characterization of Zn- and Fe-substituted $LiMnO_2$ as cathode materials in Li-ion cells

Suresh, P and Shukla, AK and Munichandraiah, N (2006) Characterization of Zn- and Fe-substituted $LiMnO_2$ as cathode materials in Li-ion cells. In: Journal of Power Sources, 161 (2). pp. 1307-1313.

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Abstract

Layered $LiMn_{1−x}M_xO_2$ (M = Zn or Fe) (0 \leq x \leq 0.3) samples are synthesized from the corresponding sodium analogues by an ion-exchange method using LiBr in n-hexanol at $160 ^oC$. The samples are subjected to physicochemical and electrochemical characterization. X-ray diffraction data indicate the formation of layered structures for the $LiMn_{1-x}M_xO_2$ samples up to x = 0.3 and for $LiMn_{1-x}M_xO_2$ samples up to x = 0.2. Among these, $LiMn_{0.95}Zn_{0.05}O_2$ and $LiMn_{0.95}Fe_{0.05}O_2$ provide the highest capacity values of 180 and $193 mAh g^{-1}$, respectively. Both Zn- and Fe-substituted samples display good capacity retention up to 30 charge–discharge cycles. Electrochemical impedance spectroscopy and galvanostatic intermittent titration data corroborate the results obtained from cyclic volatmmetry and charge–discharge cycling.

Item Type:	Journal Article
Publication:	Journal of Power Sources
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Substituted LiMnO2;Lithium-ion cells;Cyclic voltammetry; Electrochemical impedance spectroscopy;Capacity
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	29 May 2008
Last Modified:	19 Sep 2010 04:45
URI:	http://eprints.iisc.ac.in/id/eprint/14104

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