In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO2 -Based Energy Storage Devices

Tsung Chun Tsai; Guan Min Huang; Chun Wei Huang; Jui Yuan Chen; Chih Chieh Yang; Tseung-Yuen Tseng; Wen-Wei Wu

doi:10.1021/acs.analchem.7b00958

In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO₂ -Based Energy Storage Devices

Tsung Chun Tsai, Guan Min Huang, Chun Wei Huang, Jui Yuan Chen, Chih Chieh Yang, Tseung-Yuen Tseng, Wen-Wei Wu^*

^*Corresponding author for this work

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

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Abstract

Transition metal oxides have attracted much interest owing to their ability to provide high power density in lithium batteries; therefore, it is important to understand the electrochemical behavior and mechanism of lithiation-delithiation processes. In this study, we successfully and directly observed the structural evolution of CNTs/MnO ₂ during the lithiation process using transmission electron microscopy (TEM). CNTs/MnO ₂ were selected due to their high surface area and capacitance effect, and the lithiation mechanism of the CNT wall expansion was systematically analyzed. Interestingly, the wall spacings of CNTs/MnO ₂ and CNTs were obviously expanded by 10.92% and 2.59%, respectively. The MnO ₂ layer caused structural defects on the CNTs surface that could allow penetration of Li ⁺ and Mn ⁴⁺ through the tube wall and hence improve the ionic transportation speed. This study provided direct evidence for understanding the role of CNTs/MnO ₂ in the lithiation process used in lithium ion batteries and also offers potential benefits for applications and development of supercapacitors.

Original language	English
Pages (from-to)	9671-9675
Number of pages	5
Journal	Analytical Chemistry
Volume	89
Issue number	18
DOIs	https://doi.org/10.1021/acs.analchem.7b00958
State	Published - 19 Sep 2017

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@article{295d814067a44645810e2c66d2f26f9a,

title = "In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO2 -Based Energy Storage Devices",

abstract = " Transition metal oxides have attracted much interest owing to their ability to provide high power density in lithium batteries; therefore, it is important to understand the electrochemical behavior and mechanism of lithiation-delithiation processes. In this study, we successfully and directly observed the structural evolution of CNTs/MnO 2 during the lithiation process using transmission electron microscopy (TEM). CNTs/MnO 2 were selected due to their high surface area and capacitance effect, and the lithiation mechanism of the CNT wall expansion was systematically analyzed. Interestingly, the wall spacings of CNTs/MnO 2 and CNTs were obviously expanded by 10.92% and 2.59%, respectively. The MnO 2 layer caused structural defects on the CNTs surface that could allow penetration of Li + and Mn 4+ through the tube wall and hence improve the ionic transportation speed. This study provided direct evidence for understanding the role of CNTs/MnO 2 in the lithiation process used in lithium ion batteries and also offers potential benefits for applications and development of supercapacitors. ",

author = "Tsai, {Tsung Chun} and Huang, {Guan Min} and Huang, {Chun Wei} and Chen, {Jui Yuan} and Yang, {Chih Chieh} and Tseung-Yuen Tseng and Wen-Wei Wu",

year = "2017",

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doi = "10.1021/acs.analchem.7b00958",

language = "English",

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T1 - In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO2 -Based Energy Storage Devices

AU - Tsai, Tsung Chun

AU - Huang, Guan Min

AU - Huang, Chun Wei

AU - Chen, Jui Yuan

AU - Yang, Chih Chieh

AU - Tseng, Tseung-Yuen

AU - Wu, Wen-Wei

PY - 2017/9/19

Y1 - 2017/9/19

N2 - Transition metal oxides have attracted much interest owing to their ability to provide high power density in lithium batteries; therefore, it is important to understand the electrochemical behavior and mechanism of lithiation-delithiation processes. In this study, we successfully and directly observed the structural evolution of CNTs/MnO 2 during the lithiation process using transmission electron microscopy (TEM). CNTs/MnO 2 were selected due to their high surface area and capacitance effect, and the lithiation mechanism of the CNT wall expansion was systematically analyzed. Interestingly, the wall spacings of CNTs/MnO 2 and CNTs were obviously expanded by 10.92% and 2.59%, respectively. The MnO 2 layer caused structural defects on the CNTs surface that could allow penetration of Li + and Mn 4+ through the tube wall and hence improve the ionic transportation speed. This study provided direct evidence for understanding the role of CNTs/MnO 2 in the lithiation process used in lithium ion batteries and also offers potential benefits for applications and development of supercapacitors.

AB - Transition metal oxides have attracted much interest owing to their ability to provide high power density in lithium batteries; therefore, it is important to understand the electrochemical behavior and mechanism of lithiation-delithiation processes. In this study, we successfully and directly observed the structural evolution of CNTs/MnO 2 during the lithiation process using transmission electron microscopy (TEM). CNTs/MnO 2 were selected due to their high surface area and capacitance effect, and the lithiation mechanism of the CNT wall expansion was systematically analyzed. Interestingly, the wall spacings of CNTs/MnO 2 and CNTs were obviously expanded by 10.92% and 2.59%, respectively. The MnO 2 layer caused structural defects on the CNTs surface that could allow penetration of Li + and Mn 4+ through the tube wall and hence improve the ionic transportation speed. This study provided direct evidence for understanding the role of CNTs/MnO 2 in the lithiation process used in lithium ion batteries and also offers potential benefits for applications and development of supercapacitors.

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U2 - 10.1021/acs.analchem.7b00958

DO - 10.1021/acs.analchem.7b00958

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SN - 0003-2700

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SP - 9671

EP - 9675

JO - Analytical Chemistry

JF - Analytical Chemistry

IS - 18

ER -

In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO₂ -Based Energy Storage Devices

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