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Investigation of the Lithiation Mechanism of Fe 3 O 4 ‐Based Composite Anode: the Effect of the Carbon Matrix
Author(s) -
Yan Chenxing,
Wu Chao,
Zhuang Quanchao,
Tian Leilei,
Cui Yongli,
Zhao Xing,
Ju Zhicheng,
Sun Xueliang
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600584
Subject(s) - anode , nyquist plot , materials science , composite number , electrode , lithium (medication) , electrochemistry , capacitance , intercalation (chemistry) , carbon fibers , analytical chemistry (journal) , chemical engineering , composite material , chemistry , inorganic chemistry , dielectric spectroscopy , medicine , engineering , endocrinology , chromatography
In this work, the Fe 3 O 4 /CNTs composite and Fe 3 O 4 /C composite were synthesized by a facile hydrothermal method without any reducing agents and pyrolysis of glucose, respectively, and the process of the first lithiation of commercial Fe 3 O 4 , Fe 3 O 4 /CNTs and Fe 3 O 4 /C electrode were systematically investigated by EIS as function of electrode potential. It is found that at intermediate degrees of intercalation, the characteristic Nyquist plots of Fe 3 O 4 electrode are composed of three parts, namely, the small semicircle in high‐frequency region can be attributed to the migration of lithium‐ion through SEI film (the resistance of SEI film coupled with SEI film capacitance) as well as contact problems; the semicircle in the medium‐frequency region is attributed to the electronic properties of the material and the large arc in low‐frequency region is due to charge transfer step. Moreover, the changes of kinetic parameters for lithiation process of Fe 3 O 4 /CNTs composite as a function of electrode potential in the first discharge cycle was discussed in detail, and the effect of carbon matrix type on the electrochemical performance and lithiation mechanism of Fe 3 O 4 electrode is given.