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Electrochemical Investigations of Mn and Al Co‐doped Li 2 FeSiO 4 /C Cathodes for Li‐Ion Battery
Author(s) -
Li Ting,
Jiang XiaoTao,
Gao Kun,
Wang ChenYi,
Li ShuDan
Publication year - 2016
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201500220
Subject(s) - chemistry , doping , analytical chemistry (journal) , electrochemistry , impurity , scanning electron microscope , dopant , titration , lithium (medication) , ion , cathode , orthosilicate , electrode , inorganic chemistry , materials science , chromatography , optoelectronics , organic chemistry , medicine , composite material , endocrinology , tetraethyl orthosilicate
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 Li 2 Fe 0 .8− x Mn 0.2 Al x SiO 4 ( 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 Li 2 Fe 0.8 Mn 0.2 SiO 4 . Though the co‐doping leads to a slight decreased capacity owing to the increased impurity and Al 3+ inertia, a better cycling performance is obtained as expected. Especially when x is 0.05, the modified sample (Li 2 Fe 0.75 Mn 0.2 Al 0.05 SiO 4 ) 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 Li 2 FeSiO 4 systems.