Rational design of metal-organic framework-templated hollow NiCo2O4 polyhedrons decorated on macroporous CNT microspheres for improved lithium-ion storage properties

Seung Keun Park, Su Hyun Yang, Yun Chan Kang

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18 Citations (Scopus)

Abstract

We report three-dimensional (3D) porous microspheres comprising interconnected carbon nanotubes (CNT) decorated with hollow NiCo2O4 polyhedrons (H-NCO/CNT) for high-performance lithium-ion batteries (LIBs). The rationally designed composites are successfully fabricated via the combination of spray-pyrolysis and solution-based methods. The macroporous CNT microsphere obtained by spray pyrolysis acts as a substrate for the growth of the zeolitic imidazolate framework-67 (ZIF-67) in ethanol solution. During ion exchange and subsequent oxidation processes, the ZIF-67 polyhedrons were converted into hollow NiCo2O4 polyhedrons consisting of small crystal domains. Rational design of such composite microspheres offers a highly conductive 3D porous network that simultaneously enables fast ion and electron diffusion deep inside the electrodes during cycling. In addition, the hollow polyhedron interiors can accommodate large volume changes and shorten the transport pathway for the ions and electrons. Owing to these structural advantages, high capacity, long cycle life, and excellent rate capability are achieved from H-NCO/CNT microspheres when applied as LIB anodes; the discharge capacity of H-NCO/CNT microspheres remained at 1673 mA h g−1 after 200 cycles at a current density of 1.0 A g−1. Even when cycled at a high current density of 20.0 A g−1, a high capacity of 639 mA h g−1 could be achieved.

Original languageEnglish
Pages (from-to)214-222
Number of pages9
JournalChemical Engineering Journal
Volume349
DOIs
Publication statusPublished - 2018 Oct 1

Fingerprint

Carbon Nanotubes
lithium
Microspheres
Lithium
Carbon nanotubes
Metals
Ions
ion
metal
Spray pyrolysis
pyrolysis
spray
Current density
electron
Electrons
Composite materials
volume change
density current
Life cycle
ethanol

Keywords

  • CNT microspheres
  • Lithium-ion batteries
  • Metal-organic framework
  • Nickel-cobalt oxides
  • Spray pyrolysis

ASJC Scopus subject areas

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

Cite this

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title = "Rational design of metal-organic framework-templated hollow NiCo2O4 polyhedrons decorated on macroporous CNT microspheres for improved lithium-ion storage properties",
abstract = "We report three-dimensional (3D) porous microspheres comprising interconnected carbon nanotubes (CNT) decorated with hollow NiCo2O4 polyhedrons (H-NCO/CNT) for high-performance lithium-ion batteries (LIBs). The rationally designed composites are successfully fabricated via the combination of spray-pyrolysis and solution-based methods. The macroporous CNT microsphere obtained by spray pyrolysis acts as a substrate for the growth of the zeolitic imidazolate framework-67 (ZIF-67) in ethanol solution. During ion exchange and subsequent oxidation processes, the ZIF-67 polyhedrons were converted into hollow NiCo2O4 polyhedrons consisting of small crystal domains. Rational design of such composite microspheres offers a highly conductive 3D porous network that simultaneously enables fast ion and electron diffusion deep inside the electrodes during cycling. In addition, the hollow polyhedron interiors can accommodate large volume changes and shorten the transport pathway for the ions and electrons. Owing to these structural advantages, high capacity, long cycle life, and excellent rate capability are achieved from H-NCO/CNT microspheres when applied as LIB anodes; the discharge capacity of H-NCO/CNT microspheres remained at 1673 mA h g−1 after 200 cycles at a current density of 1.0 A g−1. Even when cycled at a high current density of 20.0 A g−1, a high capacity of 639 mA h g−1 could be achieved.",
keywords = "CNT microspheres, Lithium-ion batteries, Metal-organic framework, Nickel-cobalt oxides, Spray pyrolysis",
author = "Park, {Seung Keun} and Yang, {Su Hyun} and Kang, {Yun Chan}",
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AU - Yang, Su Hyun

AU - Kang, Yun Chan

PY - 2018/10/1

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N2 - We report three-dimensional (3D) porous microspheres comprising interconnected carbon nanotubes (CNT) decorated with hollow NiCo2O4 polyhedrons (H-NCO/CNT) for high-performance lithium-ion batteries (LIBs). The rationally designed composites are successfully fabricated via the combination of spray-pyrolysis and solution-based methods. The macroporous CNT microsphere obtained by spray pyrolysis acts as a substrate for the growth of the zeolitic imidazolate framework-67 (ZIF-67) in ethanol solution. During ion exchange and subsequent oxidation processes, the ZIF-67 polyhedrons were converted into hollow NiCo2O4 polyhedrons consisting of small crystal domains. Rational design of such composite microspheres offers a highly conductive 3D porous network that simultaneously enables fast ion and electron diffusion deep inside the electrodes during cycling. In addition, the hollow polyhedron interiors can accommodate large volume changes and shorten the transport pathway for the ions and electrons. Owing to these structural advantages, high capacity, long cycle life, and excellent rate capability are achieved from H-NCO/CNT microspheres when applied as LIB anodes; the discharge capacity of H-NCO/CNT microspheres remained at 1673 mA h g−1 after 200 cycles at a current density of 1.0 A g−1. Even when cycled at a high current density of 20.0 A g−1, a high capacity of 639 mA h g−1 could be achieved.

AB - We report three-dimensional (3D) porous microspheres comprising interconnected carbon nanotubes (CNT) decorated with hollow NiCo2O4 polyhedrons (H-NCO/CNT) for high-performance lithium-ion batteries (LIBs). The rationally designed composites are successfully fabricated via the combination of spray-pyrolysis and solution-based methods. The macroporous CNT microsphere obtained by spray pyrolysis acts as a substrate for the growth of the zeolitic imidazolate framework-67 (ZIF-67) in ethanol solution. During ion exchange and subsequent oxidation processes, the ZIF-67 polyhedrons were converted into hollow NiCo2O4 polyhedrons consisting of small crystal domains. Rational design of such composite microspheres offers a highly conductive 3D porous network that simultaneously enables fast ion and electron diffusion deep inside the electrodes during cycling. In addition, the hollow polyhedron interiors can accommodate large volume changes and shorten the transport pathway for the ions and electrons. Owing to these structural advantages, high capacity, long cycle life, and excellent rate capability are achieved from H-NCO/CNT microspheres when applied as LIB anodes; the discharge capacity of H-NCO/CNT microspheres remained at 1673 mA h g−1 after 200 cycles at a current density of 1.0 A g−1. Even when cycled at a high current density of 20.0 A g−1, a high capacity of 639 mA h g−1 could be achieved.

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KW - Lithium-ion batteries

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