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 language | English |
|---|---|
| Pages (from-to) | 397-407 |
| Number of pages | 11 |
| Journal | Nano Energy |
| Volume | 32 |
| DOIs | |
| Publication status | Published - 2017 Feb 1 |
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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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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 journal › Article
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
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=85008698672&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85008698672&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2016.12.058
DO - 10.1016/j.nanoen.2016.12.058
M3 - Article
AN - SCOPUS:85008698672
VL - 32
SP - 397
EP - 407
JO - Nano Energy
JF - Nano Energy
SN - 2211-2855
ER -