In situ analysis of SnO2/Fe2O3/RGO to unravel the structural collapse mechanism and enhanced electrical conductivity for lithium-ion batteries

Kangsoo Lee, Seoyoon Shin, Thomas Degen, Wooyoung Lee, Young Soo Yoon

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Herein, we describe a microwave-assisted hydrothermal process to synthesize α-Fe2O3 nanotubes/SnO2 nanorods/reduced graphene oxide (FNT/S/RGO) for application as a high-performance anode in lithium-ion batteries (LIBs). The composite products exhibit anisotropic growth because of heteronucleation and the preferred orientation of SnO2. SnO2 nanorods on the FNT surfaces are converted into Sn metal during the alloying/dealloying reaction, which offers improved electrical conductivity. The FNT/S/RGO show substantially enhanced electrochemical properties because of the reduced volume expansion effect, which improves the electrical and Li-ion conductivity and provides a large surface area. As a consequence, the FNT/S/RGO anode delivers a high reversible capacity of 883 mA h g−1 even at a current density of 200 mA g−1, with a capacity retention of 90% between the 1st and 220th cycles, excellent high-rate capacity (382 mA h g−1 at 4320 mA g−1), and long-term cycle durability (maintaining 629 mA h g−1 at 1000 mA g−1 for 1000 cycles). The presented FNT/S/RGO electrodes are the most efficient SnO2- and Fe2O3-based anode electrodes reported thus far for LIBs. The origin of the synergistic effect and the reaction mechanism of the FNT/S/RGO was thoroughly investigated using various in situ transmission electron microscopy, electrochemical impedance spectroscopy, and X-ray diffraction analysis methods.

Original languageEnglish
Pages (from-to)397-407
Number of pages11
JournalNano Energy
Volume32
DOIs
Publication statusPublished - 2017 Feb 1

Fingerprint

Nanorods
Graphite
Oxides
Graphene
Nanotubes
Anodes
Electrodes
Electrochemical impedance spectroscopy
Electrochemical properties
Alloying
X ray diffraction analysis
Electric Conductivity
Lithium-ion batteries
Durability
Current density
Metals
Microwaves
Ions
Transmission electron microscopy
Composite materials

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

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title = "In situ analysis of SnO2/Fe2O3/RGO to unravel the structural collapse mechanism and enhanced electrical conductivity for lithium-ion batteries",
abstract = "Herein, we describe a microwave-assisted hydrothermal process to synthesize α-Fe2O3 nanotubes/SnO2 nanorods/reduced graphene oxide (FNT/S/RGO) for application as a high-performance anode in lithium-ion batteries (LIBs). The composite products exhibit anisotropic growth because of heteronucleation and the preferred orientation of SnO2. SnO2 nanorods on the FNT surfaces are converted into Sn metal during the alloying/dealloying reaction, which offers improved electrical conductivity. The FNT/S/RGO show substantially enhanced electrochemical properties because of the reduced volume expansion effect, which improves the electrical and Li-ion conductivity and provides a large surface area. As a consequence, the FNT/S/RGO anode delivers a high reversible capacity of 883 mA h g−1 even at a current density of 200 mA g−1, with a capacity retention of 90{\%} between the 1st and 220th cycles, excellent high-rate capacity (382 mA h g−1 at 4320 mA g−1), and long-term cycle durability (maintaining 629 mA h g−1 at 1000 mA g−1 for 1000 cycles). The presented FNT/S/RGO electrodes are the most efficient SnO2- and Fe2O3-based anode electrodes reported thus far for LIBs. The origin of the synergistic effect and the reaction mechanism of the FNT/S/RGO was thoroughly investigated using various in situ transmission electron microscopy, electrochemical impedance spectroscopy, and X-ray diffraction analysis methods.",
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In situ analysis of SnO2/Fe2O3/RGO to unravel the structural collapse mechanism and enhanced electrical conductivity for lithium-ion batteries. / Lee, Kangsoo; Shin, Seoyoon; Degen, Thomas; Lee, Wooyoung; Yoon, Young Soo.

In: Nano Energy, Vol. 32, 01.02.2017, p. 397-407.

Research output: Contribution to journalArticle

TY - JOUR

T1 - In situ analysis of SnO2/Fe2O3/RGO to unravel the structural collapse mechanism and enhanced electrical conductivity for lithium-ion batteries

AU - Lee, Kangsoo

AU - Shin, Seoyoon

AU - Degen, Thomas

AU - Lee, Wooyoung

AU - Yoon, Young Soo

PY - 2017/2/1

Y1 - 2017/2/1

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AB - Herein, we describe a microwave-assisted hydrothermal process to synthesize α-Fe2O3 nanotubes/SnO2 nanorods/reduced graphene oxide (FNT/S/RGO) for application as a high-performance anode in lithium-ion batteries (LIBs). The composite products exhibit anisotropic growth because of heteronucleation and the preferred orientation of SnO2. SnO2 nanorods on the FNT surfaces are converted into Sn metal during the alloying/dealloying reaction, which offers improved electrical conductivity. The FNT/S/RGO show substantially enhanced electrochemical properties because of the reduced volume expansion effect, which improves the electrical and Li-ion conductivity and provides a large surface area. As a consequence, the FNT/S/RGO anode delivers a high reversible capacity of 883 mA h g−1 even at a current density of 200 mA g−1, with a capacity retention of 90% between the 1st and 220th cycles, excellent high-rate capacity (382 mA h g−1 at 4320 mA g−1), and long-term cycle durability (maintaining 629 mA h g−1 at 1000 mA g−1 for 1000 cycles). The presented FNT/S/RGO electrodes are the most efficient SnO2- and Fe2O3-based anode electrodes reported thus far for LIBs. The origin of the synergistic effect and the reaction mechanism of the FNT/S/RGO was thoroughly investigated using various in situ transmission electron microscopy, electrochemical impedance spectroscopy, and X-ray diffraction analysis methods.

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