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Title: Lithiated O2 phase, Li(2/3)+x(Co0.15Mn0.85)O2 as cathode for Li-ion batteries
Authors: Shaju, K.M. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Keywords: Cathode material
Layered O2-structure
Li-ion cell and XPS
Issue Date: Dec-2002
Citation: Shaju, K.M., Subba Rao, G.V., Chowdari, B.V.R. (2002-12). Lithiated O2 phase, Li(2/3)+x(Co0.15Mn0.85)O2 as cathode for Li-ion batteries. Solid State Ionics 152-153 : 69-81. ScholarBank@NUS Repository.
Abstract: Synthesis, characterization and cathodic behaviour of O2-phase layered manganese oxides, Li2/3(Co0.15Mn0.85)O2 (O2(Li)) and Li(2/3)+x(Co0.15Mn0.85)O2 (O2(Li+x)) have been reported. The precursor compound for the synthesis is Na2/3(Co0.15Mn0.85)O2. X-ray diffraction (XRD), infra-red (IR) and X-ray photoelectron spectra (XPS) data are consistent with that expected for both the compounds with regard to the structure and valence state. The first-charge capacities of O2(Li) and O2(Li+x) are 129 and 210 mA h/g, respectively, at 0.1 C rate and 2.5-4.6 V (vs. Li). Reversible capacities of 140-150 mA h/g were obtained for both the above compounds and the voltage vs. capacity profile shows an irreversible plateau at 4.3-4.6 V for the first charge, which is in accord with the cyclic voltammograms. An irreversible capacity loss (ICL) of 62 mA h/g is encountered in O2(Li+x) during the first charge and discharge. Performance of the Li-ion cell, C/electrolyte/O2(Li+x) has been evaluated and shows that the ICL of the compound is effectively utilized for the irreversible consumption of lithium by the graphite anode in the Li-ion cell, thereby demonstrating that the compound O2(Li+x) is a viable cathode material. © 2002 Published by Elsevier Science B.V.
Source Title: Solid State Ionics
ISSN: 01672738
DOI: 10.1016/S0167-2738(02)00340-5
Appears in Collections:Staff Publications

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