Electrochemical Effect of Cokes-Derived Activated Carbon with Partially Graphitic Structure for Hybrid Supercapacitors

Seo Hui Kang; Jun Hui Jeong; Ji Su Chae; Yun Chan Kang; Kwang Chul Roh

doi:10.1002/celc.202100593

Electrochemical Effect of Cokes-Derived Activated Carbon with Partially Graphitic Structure for Hybrid Supercapacitors

Seo Hui Kang, Jun Hui Jeong, Ji Su Chae, Yun Chan Kang, Kwang Chul Roh

Department of Materials Science and Engineering

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

1 Citation (Scopus)

Abstract

We report the optimized electrochemical performance of a hybrid supercapacitor constructed with cokes-derived activated carbon (CAC) and Li₄Ti₅O₁₂/carbon nanotube (LTO/CNT), which has improved capacitance and rate capability. The improved capacitance of the CAC is attributed to additional shallow intercalation due to the remaining graphitic structure with ion adsorption via optimized surface area and pore structure. The graphitic structure is partially maintained via adjusted KOH activation conditions. The improved rate capability of LTO/CNT is affected by the increase in electronic conductivity, which entails the formation of an electron pathway via a 3D CNT network, whereas nanosized LTO arrangements are embedded in the CNT structure. The maximum energy and power densities of the hybrid supercapacitor are 69.1 Wh kg⁻¹ and 16.5 W kg⁻¹, respectively, whereas the cycle-life performance is 88 % after 8000 cycles. This hybrid supercapacitor can allow for the expansion of the application of supercapacitors.

Original language	English
Pages (from-to)	3621-3628
Number of pages	8
Journal	ChemElectroChem
Volume	8
Issue number	19
DOIs	https://doi.org/10.1002/celc.202100593
Publication status	Published - 2021 Oct 1

Bibliographical note

Funding Information:
This work was supported by a grant from the Fundamental R&D program and funded by the Korea Institute of Ceramic Engineering and Technology (KICET) and Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea (Project No. KPP19006). This work was supported by the Technology Innovation Program (20004958, Development of ultra‐high performance supercapacitor and high power module) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Publisher Copyright:
© 2021 Wiley-VCH GmbH.

Keywords

activated carbon
asymmetric supercapacitors
carbon composites
hybrid supercapacitors
LiTiO/CNT
partially graphitic structure

ASJC Scopus subject areas

Catalysis
Electrochemistry

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Cite this

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title = "Electrochemical Effect of Cokes-Derived Activated Carbon with Partially Graphitic Structure for Hybrid Supercapacitors",

abstract = "We report the optimized electrochemical performance of a hybrid supercapacitor constructed with cokes-derived activated carbon (CAC) and Li4Ti5O12/carbon nanotube (LTO/CNT), which has improved capacitance and rate capability. The improved capacitance of the CAC is attributed to additional shallow intercalation due to the remaining graphitic structure with ion adsorption via optimized surface area and pore structure. The graphitic structure is partially maintained via adjusted KOH activation conditions. The improved rate capability of LTO/CNT is affected by the increase in electronic conductivity, which entails the formation of an electron pathway via a 3D CNT network, whereas nanosized LTO arrangements are embedded in the CNT structure. The maximum energy and power densities of the hybrid supercapacitor are 69.1 Wh kg−1 and 16.5 W kg−1, respectively, whereas the cycle-life performance is 88 % after 8000 cycles. This hybrid supercapacitor can allow for the expansion of the application of supercapacitors.",

keywords = "activated carbon, asymmetric supercapacitors, carbon composites, hybrid supercapacitors, LiTiO/CNT, partially graphitic structure",

author = "Kang, {Seo Hui} and Jeong, {Jun Hui} and Chae, {Ji Su} and Kang, {Yun Chan} and Roh, {Kwang Chul}",

note = "Funding Information: This work was supported by a grant from the Fundamental R&D program and funded by the Korea Institute of Ceramic Engineering and Technology (KICET) and Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea (Project No. KPP19006). This work was supported by the Technology Innovation Program (20004958, Development of ultra‐high performance supercapacitor and high power module) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH.",

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AU - Roh, Kwang Chul

N1 - Funding Information: This work was supported by a grant from the Fundamental R&D program and funded by the Korea Institute of Ceramic Engineering and Technology (KICET) and Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea (Project No. KPP19006). This work was supported by the Technology Innovation Program (20004958, Development of ultra‐high performance supercapacitor and high power module) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). Publisher Copyright: © 2021 Wiley-VCH GmbH.

PY - 2021/10/1

Y1 - 2021/10/1

N2 - We report the optimized electrochemical performance of a hybrid supercapacitor constructed with cokes-derived activated carbon (CAC) and Li4Ti5O12/carbon nanotube (LTO/CNT), which has improved capacitance and rate capability. The improved capacitance of the CAC is attributed to additional shallow intercalation due to the remaining graphitic structure with ion adsorption via optimized surface area and pore structure. The graphitic structure is partially maintained via adjusted KOH activation conditions. The improved rate capability of LTO/CNT is affected by the increase in electronic conductivity, which entails the formation of an electron pathway via a 3D CNT network, whereas nanosized LTO arrangements are embedded in the CNT structure. The maximum energy and power densities of the hybrid supercapacitor are 69.1 Wh kg−1 and 16.5 W kg−1, respectively, whereas the cycle-life performance is 88 % after 8000 cycles. This hybrid supercapacitor can allow for the expansion of the application of supercapacitors.

AB - We report the optimized electrochemical performance of a hybrid supercapacitor constructed with cokes-derived activated carbon (CAC) and Li4Ti5O12/carbon nanotube (LTO/CNT), which has improved capacitance and rate capability. The improved capacitance of the CAC is attributed to additional shallow intercalation due to the remaining graphitic structure with ion adsorption via optimized surface area and pore structure. The graphitic structure is partially maintained via adjusted KOH activation conditions. The improved rate capability of LTO/CNT is affected by the increase in electronic conductivity, which entails the formation of an electron pathway via a 3D CNT network, whereas nanosized LTO arrangements are embedded in the CNT structure. The maximum energy and power densities of the hybrid supercapacitor are 69.1 Wh kg−1 and 16.5 W kg−1, respectively, whereas the cycle-life performance is 88 % after 8000 cycles. This hybrid supercapacitor can allow for the expansion of the application of supercapacitors.

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KW - partially graphitic structure

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Electrochemical Effect of Cokes-Derived Activated Carbon with Partially Graphitic Structure for Hybrid Supercapacitors

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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