Abstract
A series of carbon-coated LiFe1 − x Mn x PO4 compounds are prepared by a hydrothermal method at 170 °C for 12 h. The structure and morphology of the prepared composites are characterized to examine the effects of Mn2+ substitution. All LiFe1 − x Mn x PO4 compositions are found to have an ordered olivine-type structure with homogeneous Fe2+ and Mn2+ distributions. The substitution leads to grain refinement from ~500 to ~150 nm, as well as to increased initial capacity and improved electronic conductivity. The amount of carbon coating varies with increased doping amount. The discharge curves of the LiFe1 − x Mn x PO4/C materials reveal a high discharge plateau corresponding to Fe2+/3+ and no obvious plateau assigned to Mn2+/3+, although a slight contribution of manganese is detected. However, the electrochemical performance, including the discharge capacity and cyclic performance, deteriorates with increased Mn content in the composite.
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This work was financially supported by the Development and Reform Commission of Guangdong Province (No.301-5).
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Raman spectroscopy results (DOC 309 kb)
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Zhao, RR., Lan, BY., Chen, HY. et al. Hydrothermal synthesis and properties of manganese-doped LiFePO4 . Ionics 18, 873–879 (2012). https://doi.org/10.1007/s11581-012-0700-5
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DOI: https://doi.org/10.1007/s11581-012-0700-5