Capacity stabilization of layered $Li_{0.9}Mn_{0.9}Ni_{0.1}O_2$ cathode material by employing ZnO coating.

Suresh, P and Shukla, AK and Munichandraiah, N (2005) Capacity stabilization of layered $Li_{0.9}Mn_{0.9}Ni_{0.1}O_2$ cathode material by employing ZnO coating. In: Materials Letters, 59 (8-9). pp. 953-958.

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Abstract

$Li_{0.9}Mn_{0.9}Ni_{0.1}O_2$ has been prepared by an ion-exchange process and evaluated as cathode material for Lithium-ion batteries. The oxide particles were subjected to surface modification by coating with a thin layer of ZnO. The ZnO-coated and uncoated material were characterized by chem. anal., powder XRD, SEM, EDAX, EDS-dot mapping, cyclic voltammetry, charge-discharge cycling and AC impedance spectroscopy. The physicochem. studies suggest the formation of a layered structure in the oxide with a uniformly dispersed ZnO coating on the fine particles. The electrochem. studies suggest a stable discharge capacity of $210 mA \hspace {3mm}h \hspace {3mm} g^{-1}$ for ZnO-coated oxide over about 50 cycles. By contrast, the capacity of the uncoated oxide decreases rapidly on cycling. The enhanced performance of these electrodes was confirmed by AC impedance studies.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier
Additional Information:	The Copyright belongs to Elsevier.
Keywords:	Layered lithium manganese oxide;Zinc oxide;Lithium-ion battery;Capacity stabilization;AC impedance
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	17 Mar 2006
Last Modified:	19 Sep 2010 04:24
URI:	http://eprints.iisc.ac.in/id/eprint/5811

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