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Jong-Tae Son,Elton Cairns 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.5
lithium insertion material having the composition LiNi0.3Co0.3Mn0.3Fe0.1O2 was synthesized by simplespectroscopy (XRD) and the galvanostatic charge-discharge method. Rietvelt analysis of the XRD patterns shows thatthis compound can be classified as α-NaFeO2 structure type (R3m; a=2.8689(5) and 14.296(5) in hexagonal setting).Rietvelt fitting shows that a relatively large amount of Fe and Ni ion occupy the Li layer (3a site) and a relatively largeamount of Li occupies the transition metal layer (3b site). LiNi0.3Co0.3Mn0.3Fe0.1O2 when cycled in the voltage range4.3-2.8 V gives an initial discharge capacity of 120 mAh/g, and stable cycling performance. LiNi0.3Co0.3Mn0.3Fe0.1O2in the voltage range 2.8-4.5 V has a discharge capacity of 140 mAh/g, and exhibits a significant loss in capacity during2.8-4.3 V and 2.8-4.5 V for 20 cycles. The XRD and electrochemical results suggested that cation mixing in this layeredstructure oxide could be causing degradation of the cell capacity.