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Preparation, electrochemical properties, and cycle mechanism of Li1−x Fe0.8Ni0.2O2-Li x MnO2 (Mn/(Fe+Ni+Mn)=0.8) material

  • Energy and Environmental Engineering
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Abstract

A new type of Li1−x Fe0.8Ni0.2O2-Li x MnO2 (Mn/(Fe+Ni+Mn)=0.8) material was synthesized at 350 °C in an air atmosphere by a solid-state reaction. The material had an XRD pattern that closely resembled that of the original Li1−x FeO2-Li x MnO2 ((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−x Fe0.8Ni0.2O2-Li x MnO2 cell showed a high initial discharge capacity above 192 mAh/g, which was higher than that of the parent Li/Li1−x FeO2-Li x MnO2 (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−x Fe0.8Ni0.2O2-Li x MnO2 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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Authors and Affiliations

  1. Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University, 300 Yongbong-dong, Gwang-ju, 550-757, Korea

    Gum-Jae Park, Jung-Bae Heo, Seung-Hyun Cho & Yun-Sung Lee

  2. Energy Business Division Development Team, Samsung SDI Co. Ltd., 508 Sungsung-dong, Cheonan, 330-300, Korea

    Sang-Ho Park

  3. Korea Electrical Engineering & Science Research Institute, Seoul National University, San 56-1 Sillim-dong, Seoul, 151-742, Korea

    Hee-Sung Ahn

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  1. Gum-Jae Park
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  2. Jung-Bae Heo
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  3. Seung-Hyun Cho
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  4. Sang-Ho Park
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Park, GJ., Heo, JB., Cho, SH. et al. Preparation, electrochemical properties, and cycle mechanism of Li1−x Fe0.8Ni0.2O2-Li x MnO2 (Mn/(Fe+Ni+Mn)=0.8) material. Korean J. Chem. Eng. 25, 1389–1396 (2008). https://doi.org/10.1007/s11814-008-0228-6

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  • DOI: https://doi.org/10.1007/s11814-008-0228-6

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