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Electrochemical Properties of $LiMn_{1-x}M_{x}O_{2}$ (M=Ni, Al, Mg) as Cathode Materials in Lithium-Ion Cells

Suresh, P and Shukla, AK and Munichandraiah, N (2005) Electrochemical Properties of $LiMn_{1-x}M_{x}O_{2}$ (M=Ni, Al, Mg) as Cathode Materials in Lithium-Ion Cells. In: Journal of The Electrochemical Society, 52 (12). A2273-A2280.

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Abstract

Layered $LiMn_{1-x}M_{x}O_{2}$ (M=Ni, Al, Mg) has been synthesized over a wide range of composition by ion-exchange from their sodium precursors and characterized. Both the lattice parameters (a and c) of the hexagonal unit cell increase with x for Ni and Mg substitutions but decrease for Al substitution. As reflected by the broad powder X-ray diffraction peaks, scanning electron micrographs show agglomeration of submicrometer-size particles. The discharge capacity of these cathode materials varies with the nature and concentration of the substituents. $LiMn_{0.95}Ni_{0.05}O_{2}$ exhibits a specific capacity of about 220 mAh $g^{-1}$ during the initial cycling, which decays gradually to about 150 mAh $g^{-1}$ after 30 charge-discharge cycles. $LiMn_{0.95}Al_{0.05}O_{2}$ and $LiMn_{0.95}Mg_{0.05}O_{2}$ yield capacity values of 180 and 150 mAh $g^{-1}$, respectively. Cyclic voltammetry, galvanostatic intermittent titration, and ac impedance data corroborate the observed discharge capacity behavior of these cathode materials.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to The Electrochemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 07 Aug 2008
Last Modified: 19 Sep 2010 04:22
URI: http://eprints.iisc.ernet.in/id/eprint/4671

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