Synthesis Process of CoSeO3 Microspheres for Unordinary Li-ion Storage Performances and Mechanism of Their Conversion Reaction with Li ions

Gi Dae Park, Jeong Hoo Hong, Jae Hun Choi, Jong Heun Lee, Yang Soo Kim, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Multicomponent materials with various double cations have been studied as anode materials of lithium-ion batteries (LIBs). Heterostructures formed by coupling different-bandgap nanocrystals enhance the surface reaction kinetics and facilitate charge transport because of the internal electric field at the heterointerface. Accordingly, metal selenites can be considered efficient anode materials of LIBs because they transform into metal selenide and oxide nanocrystals in the first cycle. However, few studies have reported synthesis of uniquely structured metal selenite microspheres. Herein, synthesis of high-porosity CoSeO3 microspheres is reported. Through one-pot oxidation at 400 °C, CoSex–C microspheres formed by spray pyrolysis transform into CoSeO3 microspheres showing unordinary cycling and rate performances. The conversion mechanism of CoSeO3 microspheres for lithium-ion storage is systematically studied by cyclic voltammetry, in situ X-ray diffraction and electrochemical impedance spectroscopy, and transmission electron microscopy. The reversible reaction mechanism of the CoSeO3 phase from the second cycle onward is evaluated as CoO + xSeO2 + (1 − x)Se + 4(x + 1)Li++ 4(x + 1)e ↔ Co + (2x + 1)Li2O + Li2Se. The CoSeO3 microspheres show a high reversible capacity of 709 mA h g−1 for the 1400th cycle at a current density of 3 A g−1 and a high reversible capacity of 526 mA h g−1 even at an extremely high current density of 30 A g−1.

Original languageEnglish
Article number1901320
JournalSmall
Volume15
Issue number24
DOIs
Publication statusPublished - 2019 Jun 14

Keywords

  • Li-ion batteries
  • anode materials
  • conversion reaction
  • metal selenite
  • spray pyrolysis

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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