Electrochemical Investigations of Mn and Al Co‐doped Li2FeSiO4/C Cathodes for Li‐Ion Battery |
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Authors: | Ting Li Xiao‐Tao Jiang Kun Gao Chen‐Yi Wang Shu‐Dan Li |
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Institution: | School of Chemistry and Materials Science, Shanxi Normal University, Linfen, China |
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Abstract: | Few studies on orthosilicate cathodes co‐doped with two cations have been reported until now. Here, we report the synthesis of Mn and Al co‐doped Li2Fe0.8?xMn0.2AlxSiO4 (x = 0.05 and 0.1) by a solid‐state reaction route and characterized by X‐ray diffraction (XRD), particle size analysis, scanning electron microscopy (SEM), galvanostatic charge/discharge tests, and capacity intermittent titration technique (CITT), as compared to the single‐doped Li2Fe0.8Mn0.2SiO4. Though the co‐doping leads to a slight decreased capacity owing to the increased impurity and Al3+ inertia, a better cycling performance is obtained as expected. Especially when x is 0.05, the modified sample (Li2Fe0.75Mn0.2Al0.05SiO4) shows an initial discharge capacity of 159.3 mAh/g and high capacity retention of 78% after 50 charge/discharge cycles. The present work indicates that a synergistic effect of Mn and Al co‐substitution at the Fe site could partly make up the disadvantage of single Mn doping, and might provide an effective guide for the dopant incorporation to Li2FeSiO4 systems. |
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Keywords: | Composites Solid state Cathodes Doping |
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