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 Copyright of this article belongs to Elsevier. Substituted LiMnO2;Lithium-ion cells;Cyclic voltammetry; Electrochemical impedance spectroscopy;Capacity Division of Chemical Sciences > Solid State & Structural Chemistry UnitDivision of Chemical Sciences > Inorganic & Physical Chemistry 29 May 2008 19 Sep 2010 04:45 http://eprints.iisc.ernet.in/id/eprint/14104