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Title: Layered manganese oxide with O2 structure, Li(2/3)+x(Ni1/3Mn2/3)O2 as cathode for Li-ion batteries
Authors: Shaju, K.M. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Keywords: Cathode material
Li-ion batteries
Issue Date: Aug-2002
Citation: Shaju, K.M., Subba Rao, G.V., Chowdari, B.V.R. (2002-08). Layered manganese oxide with O2 structure, Li(2/3)+x(Ni1/3Mn2/3)O2 as cathode for Li-ion batteries. Electrochemistry Communications 4 (8) : 633-638. ScholarBank@NUS Repository.
Abstract: Using LiI as the reducing agent, the compound O2- Li(2/3)+x(Ni1/3Mn2/3)O2, x ∼ 1/3 (O2(Li + x) has been prepared from the O2-Li2/3 (Ni1/3Mn2/3)O2 (O2(Li)). Cyclic voltammetry and voltage-capacity profiles of the O2(Li + x) phase are qualitatively different from that of O2(Li) phase. The first extraction capacity of O2(Li + x) at C/10 rate is 190 mAh/g corresponding to the removal of 2/3 mole of Li from the compound. At C/5 rate it delivers a reversible capacity of 158 mAh/g at 25 °C and 184 mAh/g at 50 °C (vs Li metal; voltage window 2.5-4.6 V). In Li-ion cells, with MCMB anode and O2(Li + x) as cathode, a discharge capacity of 140 mAh/g was obtained at C/5 rate in the voltage window 2.5-4.5 V (25 °C). The charge-discharge cycling performance and the cyclic voltammograms reveal that O2(Li) and O2(Li + x) do not convert to the spinel structure. © 2002 Published by Elsevier Science B.V.
Source Title: Electrochemistry Communications
ISSN: 13882481
DOI: 10.1016/S1388-2481(02)00392-2
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