Electrochemical reaction mechanism of amorphous iron selenite with ultrahigh rate and excellent cyclic stability performance as new anode material for lithium-ion batteries

Gi Dae Park, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Metal selenite materials have unique advantages from forming metal oxide and selenide heterostructure nanocrystals, which assist in accelerating electron and lithium-ion transportation and providing more active sites via interfacial coupling, during the first cycle. In this study, synthesis of amorphous iron selenite materials derived via oxidation at a low temperature of 250 °C of crystalline iron selenide was firstly researched in detail, and their composite (FeSeO–C–CNT) with carbon materials was applied as an anode material for lithium-ion batteries. The reversible reaction mechanism of iron selenite with Li ions is described by the reaction: Fe2O3 + FeSe2 + xSeO2 + (1 − x)Se + (4x + 12)Li+ + (4x + 12)e ↔ 3Fe + (2x + 3)Li2O + 3Li2Se. FeSeO–C–CNT composite electrode showed high reversible capacities of 617 mA h g−1 for the 1800th cycle even at an extremely high current density of 30 A g−1, which surprisingly indicated that FeSeO–C–CNT is enabled to fully charge in a very short time of 72 s. This study demonstrated that amorphous iron selenite materials could be excellent candidates for new anode compositions with high capacities and fast electrochemical kinetics properties.

Original languageEnglish
Article number124350
JournalChemical Engineering Journal
Volume389
DOIs
Publication statusPublished - 2020 Jun 1

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Keywords

  • Amorphous structures
  • Anode materials
  • Heterointerfaces
  • Iron selenite
  • Lithium-ion batteries

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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