A Salt-Templated Strategy toward Hollow Iron Selenides-Graphitic Carbon Composite Microspheres with Interconnected Multicavities as High-Performance Anode Materials for Sodium-Ion Batteries

Jae Hun Choi, Seung Keun Park, Yun Chan Kang

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In this work, a facile salt-templated approach is developed for the preparation of hollow FeSe2/graphitic carbon composite microspheres as sodium-ion battery anodes; these are composed of interconnected multicavities and an enclosed surface in-plane embedded with uniform hollow FeSe2 nanoparticles. As the precursor, Fe2O3/carbon microspheres containing NaCl nanocrystals are obtained using one-pot ultrasonic spray pyrolysis in which inexpensive NaCl and dextrin are used as a porogen and carbon source, respectively, enabling mass production of the composites. During post-treatment, Fe2O3 nanoparticles in the composites transform into hollow FeSe2 nanospheres via the Kirkendall effect. These rational structures provide numerous conductive channels to facilitate ion/electron transport and enhance the capacitive contribution. Moreover, the synergistic effect between the hollow cavities within FeSe2 and the outstanding mechanical strength of the porous carbon matrix can effectively accommodate the large volume changes during cycling. Correspondingly, the composite microsphere exhibits high discharge capacity of 510 mA h g−1 after 200 cycles at 0.2 A g−1 with capacity retention of 88% when calculated from the second cycle. Even at a high current density of 5.0 A g−1, a high discharge capacity of 417 mA h g−1 can be achieved.

Original languageEnglish
Article number1803043
JournalSmall
Volume15
Issue number2
DOIs
Publication statusPublished - 2019 Jan 11

Fingerprint

Microspheres
Anodes
Electrodes
Carbon
Iron
Salts
Sodium
Nanoparticles
Ions
Composite materials
Nanospheres
Spray pyrolysis
Ion Transport
Electron Transport
Ultrasonics
Nanocrystals
Strength of materials
Current density

Keywords

  • hollow structures
  • iron selenide
  • Kirkendall effect
  • sodium-ion batteries
  • spray pyrolysis

ASJC Scopus subject areas

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

Cite this

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title = "A Salt-Templated Strategy toward Hollow Iron Selenides-Graphitic Carbon Composite Microspheres with Interconnected Multicavities as High-Performance Anode Materials for Sodium-Ion Batteries",
abstract = "In this work, a facile salt-templated approach is developed for the preparation of hollow FeSe2/graphitic carbon composite microspheres as sodium-ion battery anodes; these are composed of interconnected multicavities and an enclosed surface in-plane embedded with uniform hollow FeSe2 nanoparticles. As the precursor, Fe2O3/carbon microspheres containing NaCl nanocrystals are obtained using one-pot ultrasonic spray pyrolysis in which inexpensive NaCl and dextrin are used as a porogen and carbon source, respectively, enabling mass production of the composites. During post-treatment, Fe2O3 nanoparticles in the composites transform into hollow FeSe2 nanospheres via the Kirkendall effect. These rational structures provide numerous conductive channels to facilitate ion/electron transport and enhance the capacitive contribution. Moreover, the synergistic effect between the hollow cavities within FeSe2 and the outstanding mechanical strength of the porous carbon matrix can effectively accommodate the large volume changes during cycling. Correspondingly, the composite microsphere exhibits high discharge capacity of 510 mA h g−1 after 200 cycles at 0.2 A g−1 with capacity retention of 88{\%} when calculated from the second cycle. Even at a high current density of 5.0 A g−1, a high discharge capacity of 417 mA h g−1 can be achieved.",
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AU - Choi, Jae Hun

AU - Park, Seung Keun

AU - Kang, Yun Chan

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