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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12958
Title: Phase stability and charge capacity of cubic spinel in Li 1+δ Mn2-δ O4 and consequence of magnesium doping
Authors: Singh P.
Sil A.
Nath M.
Ray S.
Published in: Journal of the Electrochemical Society
Abstract: The X-ray diffraction analysis of Li1+δ Mn 2-δ O4 having δ=0.00, 0.03, 0.06, 0.12, 0.18, 0.24, 0.33, 0.42, and 0.50 powders, synthesized by a sol-gel process, shows that a single-phase cubic spinel structure is stable only when δ0.24. When lithium content increases to δ>0.24, the percentage of monoclinic Li2 MnO3 increases until δ=0.42 and saturates thereafter. On magnesium doping, the range of stability of cubic spinel Li 1+δ Mn2-δ-0.1 Mg0.1 O4 decreases to δ0.18, and monoclinic Li2 MnO3 starts to appear when δ>0.18. In magnesium-doped Li1+δ Mn1.9-δ-0.1 Mg0.1 O4, the ion Mg 2+ goes to octahedral sites and decreases the population of Mn3+ in the 16d octahedral sites, and so the lattice parameter of the magnesium-doped cubic spinel for the same δ is lower than that for undoped Li 1+δ Mn2-δ O4. However, at higher δ, the population of Mn3+ may get totally exhausted and the charge balance may be maintained by the creation of defects. The voltage step appearing in the discharge curve has been attributed to a transition from two cubic phases to one cubic phase. With increasing δ, the size of the step decreases and becomes broader. However, this voltage step does not appear to be affected by magnesium doping. © 2010 The Electrochemical Society.
Citation: Journal of the Electrochemical Society (2010), 157(3): A259-A266
URI: https://doi.org/10.1149/1.3273195
http://repository.iitr.ac.in/handle/123456789/12958
Issue Date: 2010
ISSN: 134651
Author Scopus IDs: 7403971769
7003754102
7103033909
7402322460
Author Affiliations: Singh, P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
Sil, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Nath, M., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
Ray, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Corresponding Author: Singh, P.; Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
Appears in Collections:Journal Publications [MT]

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