Synthesis Process of CoSeO 3 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 journalArticle

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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 CoSeO 3 microspheres is reported. Through one-pot oxidation at 400 °C, CoSe x –C microspheres formed by spray pyrolysis transform into CoSeO 3 microspheres showing unordinary cycling and rate performances. The conversion mechanism of CoSeO 3 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 CoSeO 3 phase from the second cycle onward is evaluated as CoO + xSeO 2 + (1 − x)Se + 4(x + 1)Li + + 4(x + 1)e ↔ Co + (2x + 1)Li 2 O + Li 2 Se. The CoSeO 3 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
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Conversion Disorder
Microspheres
Ions
Lithium
Selenious Acid
Metals
Nanoparticles
Nanocrystals
Anodes
Electrodes
Current density
Dielectric Spectroscopy
Spray pyrolysis
Porosity
Surface reactions
Transmission Electron Microscopy
Electrochemical impedance spectroscopy
Reaction kinetics
X-Ray Diffraction
Oxides

Keywords

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

ASJC Scopus subject areas

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

Cite this

Synthesis Process of CoSeO 3 Microspheres for Unordinary Li-ion Storage Performances and Mechanism of Their Conversion Reaction with Li ions . / Park, Gi Dae; Hong, Jeong Hoo; Choi, Jae Hun; Lee, Jong Heun; Kim, Yang Soo; Kang, Yun Chan.

In: Small, 01.01.2019.

Research output: Contribution to journalArticle

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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 CoSeO 3 microspheres is reported. Through one-pot oxidation at 400 °C, CoSe x –C microspheres formed by spray pyrolysis transform into CoSeO 3 microspheres showing unordinary cycling and rate performances. The conversion mechanism of CoSeO 3 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 CoSeO 3 phase from the second cycle onward is evaluated as CoO + xSeO 2 + (1 − x)Se + 4(x + 1)Li + + 4(x + 1)e − ↔ Co + (2x + 1)Li 2 O + Li 2 Se. The CoSeO 3 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 .",
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