Hydrothermal synthesis and properties of manganese-doped LiFePO4 |
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Authors: | Rui-Rui Zhao Bing-Yan Lan Hong-Yu Chen Guo-Zheng Ma |
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Institution: | 1. School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People??s Republic of China 2. Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou, 510006, People??s Republic of China 3. Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education), South China Normal University, Guangzhou, 510006, People??s Republic of China
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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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