| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Preparation of Lithium Manganese Iron Phosphate Cathode Material by Improved High-temperature Solid-state Method |
| LI Jing, QIN Yuanbin, NING Xiaohui
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| School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract LiMn1-xFexPO4 with the advantages of low cost, environmental amity, high energy density, good thermal stability as well as superior cycling stability, has a good application prospect for lithium-ion batteries. Among various methods for preparing LiMn1-xFexPO4, the high-temperature solid-state method has been widely used because of its simple process, low cost and high yield. However, the particle size of LiMn1-x-FexPO4 is not well-distributed by the high-temperature solid-state method and the particles are easy to aggregate. To solve these problems, the sucrose was used as carbon source to obtain secondary carbon-coated LiMn0.5Fe0.5PO4 material by an improved high-temperature solid-state method in this paper. The structure and the morphologies of the as-prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM). The results showed that the secondary carbon-coated LiMn0.5Fe0.5-PO4 had a single olivine phase and an average particle size of 260 nm. The electrochemical properties of the secondary carbon-coated LiMn0.5-Fe0.5PO4 were studied by galvanostatic charge-discharge method. The LiMn0.5Fe0.5PO4/C could deliver discharge capacities of 165 mAh/g, 132 mAh/g and 92 mAh/g at 0.1C, 1C, and 10C rate, respectively. The capacity retention was more than 90% after 100 cycles at 1C, showing the excellent rate capability and cyclability. In addition, the reason for the improved electrochemical properties of the secondary carbon-coated LiMn0.5Fe0.5PO4 had also been investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements.
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Published: 24 July 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51874228, U1766216). |
About author:: Jing Lihas been studying for her master’s degree at Xi’an Jiaotong University since September 2017. She mainly engaged in the preparation and modification of cathode materials for lithium-ion batteries under the supervision of associate professor Xiaohui Ning.
Xiaohui Ningreceived his B.S and M.S degrees in Hunan University in 2003 and 2006, respectively, and his Ph. D in non-ferrous metallurgy from University of Science and Technology Beijing, China in 2011. From 2012 to 2013, he was a postdoctoral associate in Department of Materials Science and Engineering at MIT. He is currently an associate professor at School of Materials Science and Engineering in Xi’an Jiaotong University in China. His research interests focus on electrochemical energy storage technologies and advanced materials for sustainable energy. |
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2020, Vol. 34 
