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Thermal stability of Fe-Mn binary olivine cathodes for Li rechargeable batteries

Cited 41 time in Web of Science Cited 40 time in Scopus
Authors
Kim, Jongsoon; Park, Kyu-Young; Park, Inchul; Yoo, Jung-Keun; Hong, Jihyun; Kang, Kisuk
Issue Date
2012-04
Citation
Journal of Materials Chemistry, Vol.22 No.24, pp.11964-11970
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 degrees 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 degrees C to 500 degrees 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.
ISSN
0959-9428
URI
http://hdl.handle.net/10371/165139
DOI
https://doi.org/10.1039/c2jm30733b
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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