Synthesis of Uniquely Structured Yolk–Shell Metal Oxide Microspheres Filled with Nitrogen-Doped Graphitic Carbon with Excellent Li–Ion Storage Performance

Jung Hyun Kim, Yun Chan Kang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Novel structured composite microspheres of metal oxide and nitrogen-doped graphitic carbon (NGC) have been developed as efficient anode materials for lithium-ion batteries. A new strategy is first applied to a one-pot preparation of composite (FeOx-NGC/Y) microspheres via spray pyrolysis. The FeOx-NGC/Y composite microspheres have a yolk–shell structure based on the iron oxide material. The void space of the yolk–shell microsphere is filled with NGC. Dicyandiamide additive plays a key role in the formation of the FeOx-NGC/Y composite microspheres by inducing Ostwald ripening to form a yolk–shell structure based on the iron oxide material. The FeOx-NGC/Y composite microspheres with the mixed crystal structure of rock salt FeO and spinel Fe3O4 phases show highly superior lithium-ion storage performances compared to the dense-structured FeOx microspheres with and without carbon material. The discharge capacities of the FeOx-NGC/Y microspheres for the 1st and 1000th cycle at 1 A g−1 are 1423 and 1071 mAh g−1, respectively. The microspheres have a reversible discharge capacity of 598 mAh g−1 at an extremely high current density of 10 A g−1. Furthermore, the strategy described in this study is generally applied to multicomponent metal oxide–carbon composite microspheres with yolk–shell structures based on metal oxide materials.

Original languageEnglish
Article number1701585
JournalSmall
Volume13
Issue number39
DOIs
Publication statusPublished - 2017 Oct 18

Fingerprint

Microspheres
Oxides
Nitrogen
Carbon
Metals
Composite materials
Iron oxides
Lithium
Ions
Ostwald ripening
Spray pyrolysis
Anodes
Nitric Oxide
Electrodes
Current density
Salts
Crystal structure
Rocks

Keywords

  • carbon composite
  • lithium secondary battery
  • nanostructured material
  • spray pyrolysis
  • yolk–shell

ASJC Scopus subject areas

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

Cite this

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abstract = "Novel structured composite microspheres of metal oxide and nitrogen-doped graphitic carbon (NGC) have been developed as efficient anode materials for lithium-ion batteries. A new strategy is first applied to a one-pot preparation of composite (FeOx-NGC/Y) microspheres via spray pyrolysis. The FeOx-NGC/Y composite microspheres have a yolk–shell structure based on the iron oxide material. The void space of the yolk–shell microsphere is filled with NGC. Dicyandiamide additive plays a key role in the formation of the FeOx-NGC/Y composite microspheres by inducing Ostwald ripening to form a yolk–shell structure based on the iron oxide material. The FeOx-NGC/Y composite microspheres with the mixed crystal structure of rock salt FeO and spinel Fe3O4 phases show highly superior lithium-ion storage performances compared to the dense-structured FeOx microspheres with and without carbon material. The discharge capacities of the FeOx-NGC/Y microspheres for the 1st and 1000th cycle at 1 A g−1 are 1423 and 1071 mAh g−1, respectively. The microspheres have a reversible discharge capacity of 598 mAh g−1 at an extremely high current density of 10 A g−1. Furthermore, the strategy described in this study is generally applied to multicomponent metal oxide–carbon composite microspheres with yolk–shell structures based on metal oxide materials.",
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N2 - Novel structured composite microspheres of metal oxide and nitrogen-doped graphitic carbon (NGC) have been developed as efficient anode materials for lithium-ion batteries. A new strategy is first applied to a one-pot preparation of composite (FeOx-NGC/Y) microspheres via spray pyrolysis. The FeOx-NGC/Y composite microspheres have a yolk–shell structure based on the iron oxide material. The void space of the yolk–shell microsphere is filled with NGC. Dicyandiamide additive plays a key role in the formation of the FeOx-NGC/Y composite microspheres by inducing Ostwald ripening to form a yolk–shell structure based on the iron oxide material. The FeOx-NGC/Y composite microspheres with the mixed crystal structure of rock salt FeO and spinel Fe3O4 phases show highly superior lithium-ion storage performances compared to the dense-structured FeOx microspheres with and without carbon material. The discharge capacities of the FeOx-NGC/Y microspheres for the 1st and 1000th cycle at 1 A g−1 are 1423 and 1071 mAh g−1, respectively. The microspheres have a reversible discharge capacity of 598 mAh g−1 at an extremely high current density of 10 A g−1. Furthermore, the strategy described in this study is generally applied to multicomponent metal oxide–carbon composite microspheres with yolk–shell structures based on metal oxide materials.

AB - Novel structured composite microspheres of metal oxide and nitrogen-doped graphitic carbon (NGC) have been developed as efficient anode materials for lithium-ion batteries. A new strategy is first applied to a one-pot preparation of composite (FeOx-NGC/Y) microspheres via spray pyrolysis. The FeOx-NGC/Y composite microspheres have a yolk–shell structure based on the iron oxide material. The void space of the yolk–shell microsphere is filled with NGC. Dicyandiamide additive plays a key role in the formation of the FeOx-NGC/Y composite microspheres by inducing Ostwald ripening to form a yolk–shell structure based on the iron oxide material. The FeOx-NGC/Y composite microspheres with the mixed crystal structure of rock salt FeO and spinel Fe3O4 phases show highly superior lithium-ion storage performances compared to the dense-structured FeOx microspheres with and without carbon material. The discharge capacities of the FeOx-NGC/Y microspheres for the 1st and 1000th cycle at 1 A g−1 are 1423 and 1071 mAh g−1, respectively. The microspheres have a reversible discharge capacity of 598 mAh g−1 at an extremely high current density of 10 A g−1. Furthermore, the strategy described in this study is generally applied to multicomponent metal oxide–carbon composite microspheres with yolk–shell structures based on metal oxide materials.

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