Long-term cycling of core-shell Fe3O4-Polypyrrole composite electrodes via diffusive and capacitive lithiation

Core-shell Fe3O4-polypyrrole (Fe3O4-PPy) composites are synthesized by etching and polymerization to address the capacity degradation and low Coulombic efficiency (CE) of the Fe3O4 electrodes for lithium storage. When the weight content of Fe3O4 is 60%, a conformal carbon-coated Fe3O4 composite is f...

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Published inJournal of alloys and compounds Vol. 835; p. 155192
Main Authors Chu, Ruixia, Tan, Donggui, Zhang, Jie, Chen, Yanli, Jiang, Heng, Lin, Jie, Li, Lei, Zhang, Ying, Guo, Hang
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.09.2020
Elsevier BV
Subjects
Capacitive lithiation
Core-shell morphology
Diffusive lithiation
Electrodes
Fe3O4-PPy
Iron oxides
Lithium
Polypyrroles
Porosity
Diffusive lithiation
Fe3O4-PPy
Capacitive lithiation
Porosity
Core-shell morphology
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Summary:Core-shell Fe3O4-polypyrrole (Fe3O4-PPy) composites are synthesized by etching and polymerization to address the capacity degradation and low Coulombic efficiency (CE) of the Fe3O4 electrodes for lithium storage. When the weight content of Fe3O4 is 60%, a conformal carbon-coated Fe3O4 composite is formed, which can retain a charge capacity of 451 mAh g−1 after 800 cycles at 2 C with a high initial CE of 74.8%. The diffusive and capacitive contribution to the capacity are evulated, demonstating the advantages of the synergistic lithiation of the Fe3O4-PPy electrodes. •Core-shell Fe3O4-polypyrrole is synthesized by simple etching and polymerization.•The influences of Fe3O4 contents to morphology and performance are investigated.•Combined lithiation mechanisms of Fe3O4-polypyrrole composites are discussed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.155192