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Synthesis and electrochemical properties of Li1−xFe0.8Ni0.2O2–LixMnO2 (Mn/(Fe + Ni + Mn) = 0.8) material |
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| Authors: | GJ Park YS Lee J Kim KS Nahm Y Sato |
| Affiliation: | 1. Faculty of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong, Gwangju 500-757, Republic Korea;2. Department of Material Science and Engineering, Chonnam National University, 300 Yongbong-dong, Gwangju 500-757, Republic Korea;3. School of Chemical Engineering and Technology, Chonbuk National University, 664-14 Duckjin-dong, Chonju 561-756, Republic Korea;4. Department of Applied Chemistry, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan |
| Abstract: | A new type of Li1−xFe0.8Ni0.2O2–LixMnO2 (Mn/(Fe + Ni + Mn) = 0.8) material was synthesized at 350 °C in air atmosphere using a solid-state reaction. The material had an XRD pattern that closely resembled that of the original Li1−xFeO2–LixMnO2 (Mn/(Fe + Mn) = 0.8) with much reduced impurity peaks. The Li/Li1−xFe0.8Ni0.2O2–LixMnO2 cell showed a high initial discharge capacity above 192 mAh g−1, which was higher than that of the parent Li/Li1−xFeO2–LixMnO2 (186 mAh g−1). We expected that the increase of initial discharge capacity and the change of shape of discharge curve for the Li/Li1−xFe0.8Ni0.2O2–LixMnO2 cell is the result from the redox reaction from Ni2+ to Ni3+ during charge/discharge process. 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. |
| Keywords: | Lithium secondary battery Cathode material Li1&minus xFeO2&ndash LixMnO2 Li1&minus xFe0 8Ni0 2O2&ndash LixMnO2 |
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