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

Park, Seung-Keun; Yang, Su Hyun; Kang, Yun Chan

doi:10.1016/j.cej.2018.05.091

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

Chemical engineering journal, v.349, 2018년, pp.214 - 222

Park, Seung-Keun (Corresponding author.) , Yang, Su Hyun , Kang, Yun Chan

Abstract ▼ AI-Helper

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. Highlights CNT microspheres decorated with hollow NiCo2O4 polyhedrons are facilely synthesized. ZIF-67 polyhedrons are converted into hollow NiCo2O4 polyhedrons. Unique structured composite microspheres exhibit excellent lithium-ion storage properties. Graphical abstract Three-dimensional interconnected microspheres comprising CNTs decorated with hollow NiCo2O4 polyhedrons were successfully synthesized via the combination of spray pyrolysis and solution-based methods. The unique features of composite microspheres such as the hollow interiors of polyhedrons and macroporous CNT backbones are beneficial for improved electrochemical performance when applied as LIB anodes. Thus, the electrode exhibited high capacity, long cycle life, and excellent rate capability as an anode material for LIBs. [DISPLAY OMISSION]

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참고문헌 (53)

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

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

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