Ragavendran, K. and Nakkiran, A. and Kalyani, P. and Veluchamy, A. and Jagannathan, R. (2008) Nickel doped spinel lithium manganate – some insights using opto-impedance. Chemical Physics Letters, 456 (1-3). pp. 110-115.

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Abstract

Opto-impedance studies on spinel type pristine and Ni-doped LiMn2O4, an important cathode system for Li-ion batteries have revealed the difference in electronic structure arising out of the Ni-substitution. The opto-impedance spectra of Ni-doped LiMn2O4 even under dark condition exhibits a more complex structure( two semicircles with some skewed structure) suggesting the presence of defect structure(s) remaining dormant which upon UV shining get merged to form a single semicircle. Qualitatively this aliovalent substitution modifies the charge transfer state and activates a defect initiated Warburg diffusion process with a time scale of � 50 ls.

Item Type:	Article
Subjects:	Lithium batteries Electrochemical Materials Science
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	16 Jan 2012 16:05
Last Modified:	16 Jan 2012 16:05
URI:	http://cecri.csircentral.net/id/eprint/47

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