| Issue |
Korean Journal of Chemical Engineering,
Vol.25, No.6, 1389-1396, 2008
Vol.25, No.6, 1389-1396, 2008
Preparation, electrochemical properties, and cycle mechanism of Li1-xFe0.8Ni0.2O2-LixMnO2 (Mn/(Fe+Ni+Mn)=0.8) materia
A new type of Li1-xFe0.8Ni0.2O2-LixMnO2 (Mn/(Fe+Ni+Mn)=0.8) material was synthesized at 350 ℃ in an air atmosphere by a solid-state reaction. The material had an XRD pattern that closely resembled that of the original Li1-xFeO2-LixMnO2 ((Fe+Ni+Mn)=0.8) with much reduced impurity peaks. It was composed of many large particles of about 500-600 nm and small particles of about 100-200 nm, which were distributed among the larger particles. The Li/Li1-xFe0.8Ni0.2O2-LixMnO2 cell showed a high initial discharge capacity above 192 mAh/g, which was higher than
that of the parent Li/Li1-xFeO2-LixMnO2 (186 mAh/g). This cell exhibited not only a typical voltage plateau in the 2.8 V region, but also an excellent cycle retention rate (96%) up to 45 cycles. We suggest a unique role of doped nickel ion in the Li/Li1-xFe0.8Ni0.2O2-LixMnO2 cell, which results in the increased initial discharge capacity from the redox reaction of Ni2+/Ni3+ between 2.0 and 1.5 V region.
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