Ghanty, C and Basu, Rajendra Nath and Majumder, S B (2014) Electrochemical performances of 0.9Li(2)MnO(3)-0.1Li(Mn0.375Ni0.375Co0.25)O-2 cathodes: Role of the cycling induced layered to spinel phase transformation. Solid State Ionics, 256. pp. 19-28. ISSN 0167-2738

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In the present work, we have reported that as compared to Li2MnO3 lean compositions, the electrochemical properties of Li2MnO3 rich integrated cathodes (viz. 0.9Li(2)MnO(3)-0.1Li(Mn0.375Ni0.375Co0.25)O-2) are singular in three different ways. First, unlike its Li2MnO3 lean counterparts, the oxygen and concomitant lithium extraction in Li2MnO3 rich composition (viz. Li(Lio31Mn(0.646)Ni(0.026)Co(0.017))O-2) continues beyond first charging cycle. Second, for Li2MnO3 rich compositions, layered to spinel phase transformation seems to be unavoidable with repeated charge-discharge cycling. Formation of spine] phase triggers capacity fading in these. cathodes. We have found that for these cathodes, galvanostatic cycling at relatively higher rate (>= 20 mA g(-1)) retards the spinel formation with concomitant improvement of capacity retention with cycling. Finally, for Li2MnO3 rich integrated cathodes the major capacity contribution is found to be due to the reversible manganese redox (-3 V and -2.6 V). Therefore, the energy densities of these cathodes are less as compared to Li2MnO3 lean compositions. (C) 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Electronics
Divisions: Fuel Cell and Battery
Depositing User: Bidhan Chaudhuri
Date Deposited: 12 Dec 2014 10:54
Last Modified: 12 Dec 2014 10:54

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