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Issue 24, 2012
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Thermal stability of Fe–Mn binary olivine cathodes for Li rechargeable batteries

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Abstract

The phase stability of binary Fe and Mn olivine materials is extensively studied with temperature-controlled in situ X-ray diffraction (XRD) for various Fe/Mn ratios and state of charges (SOCs). We identify that the thermal behavior of partially charged olivine materials is sensitively affected by the Fe/Mn ratio in the crystal. While Fe-rich binary olivine materials readily formed a solid solution phase of Li1−yFe1−xMnxPO4 near room temperature or with only slight heating, the Mn-rich binary olivine retained its two-phase characteristic up to ca. 250 °C before decomposition into non-olivine phases. The thermal stability and decomposition mechanism of fully delithiated olivine materials are more sensitively affected by the Fe/Mn ratio in the crystal. The decomposition temperature varies from 200 °C to 500 °C among the different Fe/Mn ratios. It is generally observed that the Mn-rich binary olivine materials are inferior to the Fe-rich ones with respect to the thermal stability in the delithiated state.

Graphical abstract: Thermal stability of Fe–Mn binary olivine cathodes for Li rechargeable batteries

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Publication details

The article was received on 07 Feb 2012, accepted on 08 Apr 2012 and first published on 13 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM30733B
Citation: J. Mater. Chem., 2012,22, 11964-11970
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    Thermal stability of Fe–Mn binary olivine cathodes for Li rechargeable batteries

    J. Kim, K. Park, I. Park, J. Yoo, J. Hong and K. Kang, J. Mater. Chem., 2012, 22, 11964
    DOI: 10.1039/C2JM30733B

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