Hierarchical yolk-shell CNT-(NiCo)O/C microspheres prepared by one-pot spray pyrolysis as anodes in lithium-ion batteries

Se Hwan Oh; Min Su Jo; Sang Mun Jeong; Yun Chan Kang; Jung Sang Cho

doi:10.1016/j.cej.2019.02.144

Hierarchical yolk-shell CNT-(NiCo)O/C microspheres prepared by one-pot spray pyrolysis as anodes in lithium-ion batteries

Se Hwan Oh, Min Su Jo, Sang Mun Jeong, Yun Chan Kang, Jung Sang Cho

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

This paper presents a hierarchical yolk–shell-structured microsphere comprising a hierarchical carbon nanotube (CNT)-(NiCo)O/C yolk and an embossed hollow thin shell (hereafter denoted as CNT-(NiCo)O/C microsphere) prepared by a one-pot spray pyrolysis process for potential use as an anode in lithium-ion batteries. During spray pyrolysis, the hierarchical CNT-(NiCo)O/C yolk, whose frame is linked with CNTs, is formed by mutual binding of the CNTs and size-controlled polystyrene (PS) nanobeads and subsequent selective decomposition of these nanobeads. Further, phase separation of melted poly(vinylpyrrolidone) facilitates the formation of the hollow shell. The discharge capacity of the CNT-(NiCo)O/C microspheres after 1000 cycles at an extremely high current density of 5.0 A g⁻¹ is 598 mA h g⁻¹. The CNT-(NiCo)O/C microspheres show reversible discharge capacities of 886, 709, 509, and 294 mA h g⁻¹ at current densities of 0.5, 5, 20, and 50 A g⁻¹, respectively. The unique nanostructure of the CNT-(NiCo)O/C microspheres with high electrical conductivity promotes the transfer kinetics of electrons and Li⁺ ions, which consequently leads to their improved electrochemical performances.

Original language	English
Pages (from-to)	438-447
Number of pages	10
Journal	Chemical Engineering Journal
Volume	368
DOIs	https://doi.org/10.1016/j.cej.2019.02.144
Publication status	Published - 2019 Jul 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2018R1A4A1024691 , NRF-2017M1A2A2087577 , and NRF-2018R1D1A3B07042514 )

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

(Ni,Co)O solid solution
Anode materials
Lithium ion batteries
Spray pyrolysis
Yolk-shell

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.cej.2019.02.144

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title = "Hierarchical yolk-shell CNT-(NiCo)O/C microspheres prepared by one-pot spray pyrolysis as anodes in lithium-ion batteries",

abstract = "This paper presents a hierarchical yolk–shell-structured microsphere comprising a hierarchical carbon nanotube (CNT)-(NiCo)O/C yolk and an embossed hollow thin shell (hereafter denoted as CNT-(NiCo)O/C microsphere) prepared by a one-pot spray pyrolysis process for potential use as an anode in lithium-ion batteries. During spray pyrolysis, the hierarchical CNT-(NiCo)O/C yolk, whose frame is linked with CNTs, is formed by mutual binding of the CNTs and size-controlled polystyrene (PS) nanobeads and subsequent selective decomposition of these nanobeads. Further, phase separation of melted poly(vinylpyrrolidone) facilitates the formation of the hollow shell. The discharge capacity of the CNT-(NiCo)O/C microspheres after 1000 cycles at an extremely high current density of 5.0 A g−1 is 598 mA h g−1. The CNT-(NiCo)O/C microspheres show reversible discharge capacities of 886, 709, 509, and 294 mA h g−1 at current densities of 0.5, 5, 20, and 50 A g−1, respectively. The unique nanostructure of the CNT-(NiCo)O/C microspheres with high electrical conductivity promotes the transfer kinetics of electrons and Li+ ions, which consequently leads to their improved electrochemical performances.",

keywords = "(Ni,Co)O solid solution, Anode materials, Lithium ion batteries, Spray pyrolysis, Yolk-shell",

author = "Oh, {Se Hwan} and Jo, {Min Su} and Jeong, {Sang Mun} and Kang, {Yun Chan} and Cho, {Jung Sang}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2018R1A4A1024691 , NRF-2017M1A2A2087577 , and NRF-2018R1D1A3B07042514 ) Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

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doi = "10.1016/j.cej.2019.02.144",

language = "English",

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AU - Oh, Se Hwan

AU - Jo, Min Su

AU - Jeong, Sang Mun

AU - Kang, Yun Chan

AU - Cho, Jung Sang

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2018R1A4A1024691 , NRF-2017M1A2A2087577 , and NRF-2018R1D1A3B07042514 ) Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/7/15

Y1 - 2019/7/15

N2 - This paper presents a hierarchical yolk–shell-structured microsphere comprising a hierarchical carbon nanotube (CNT)-(NiCo)O/C yolk and an embossed hollow thin shell (hereafter denoted as CNT-(NiCo)O/C microsphere) prepared by a one-pot spray pyrolysis process for potential use as an anode in lithium-ion batteries. During spray pyrolysis, the hierarchical CNT-(NiCo)O/C yolk, whose frame is linked with CNTs, is formed by mutual binding of the CNTs and size-controlled polystyrene (PS) nanobeads and subsequent selective decomposition of these nanobeads. Further, phase separation of melted poly(vinylpyrrolidone) facilitates the formation of the hollow shell. The discharge capacity of the CNT-(NiCo)O/C microspheres after 1000 cycles at an extremely high current density of 5.0 A g−1 is 598 mA h g−1. The CNT-(NiCo)O/C microspheres show reversible discharge capacities of 886, 709, 509, and 294 mA h g−1 at current densities of 0.5, 5, 20, and 50 A g−1, respectively. The unique nanostructure of the CNT-(NiCo)O/C microspheres with high electrical conductivity promotes the transfer kinetics of electrons and Li+ ions, which consequently leads to their improved electrochemical performances.

AB - This paper presents a hierarchical yolk–shell-structured microsphere comprising a hierarchical carbon nanotube (CNT)-(NiCo)O/C yolk and an embossed hollow thin shell (hereafter denoted as CNT-(NiCo)O/C microsphere) prepared by a one-pot spray pyrolysis process for potential use as an anode in lithium-ion batteries. During spray pyrolysis, the hierarchical CNT-(NiCo)O/C yolk, whose frame is linked with CNTs, is formed by mutual binding of the CNTs and size-controlled polystyrene (PS) nanobeads and subsequent selective decomposition of these nanobeads. Further, phase separation of melted poly(vinylpyrrolidone) facilitates the formation of the hollow shell. The discharge capacity of the CNT-(NiCo)O/C microspheres after 1000 cycles at an extremely high current density of 5.0 A g−1 is 598 mA h g−1. The CNT-(NiCo)O/C microspheres show reversible discharge capacities of 886, 709, 509, and 294 mA h g−1 at current densities of 0.5, 5, 20, and 50 A g−1, respectively. The unique nanostructure of the CNT-(NiCo)O/C microspheres with high electrical conductivity promotes the transfer kinetics of electrons and Li+ ions, which consequently leads to their improved electrochemical performances.

KW - (Ni,Co)O solid solution

KW - Anode materials

KW - Lithium ion batteries

KW - Spray pyrolysis

KW - Yolk-shell

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DO - 10.1016/j.cej.2019.02.144

M3 - Article

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SN - 1385-8947

VL - 368

SP - 438

EP - 447

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

ER -

Hierarchical yolk-shell CNT-(NiCo)O/C microspheres prepared by one-pot spray pyrolysis as anodes in lithium-ion batteries

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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