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Bifunctional effects of nitrogen-doped carbon quantum dots on CoS2/mesoporous carbon composites for high-performance lithium-ion batteries.

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Title: Bifunctional effects of nitrogen-doped carbon quantum dots on CoS2/mesoporous carbon composites for high-performance lithium-ion batteries.
Authors: Lee, Hae Ri1 (AUTHOR), Kim, Yun Sik1 (AUTHOR), Lee, Seon Yeong1 (AUTHOR), Son, U Hyeok1 (AUTHOR), Lee, Sungho2 (AUTHOR), Joh, Han-Ik1 (AUTHOR) hijoh@konkuk.ac.kr
Source: Applied Surface Science. Aug2024, Vol. 664, pN.PAG-N.PAG. 1p.
Subjects: Quantum dots, Doping agents (Chemistry), Lithium-ion batteries, Carbon, Carbon composites, Functional groups
Abstract: [Display omitted] • Nitrogen-doped carbon dots (NCQDs) were synthesized by oxidation of NMP solvent. • NCQDs acted as both an etchant and nitrogen source on ZIF-67. • NCQDs were applied to control the porosity and the heteroatom content of CoS 2 /NSC. • CoS 2 /NSC from pre-treated ZIF-67 achieved enhanced cycling performances in LIBs. Cobalt disulfide (CoS 2) stands as a promising candidate for anode materials in lithium-ion batteries due to its high theoretical capacity, but it faces challenges associated with the shuttle effect of lithium polysulfide during cycling. To address these issues, zeolitic imidazolate framework (ZIF)-derived composites have been extensively explored because of distinct advantages such as the formation of nano-sized particles, heteroatom doping, and highly porous structures. However, ZIF-derived carbon supports primarily consist of ultra-micropores that can impede lithium-ion diffusion. Herein, we aimed to enhance cycling stability by introducing a nitrogen-doped carbon quantum dot (NCQD) solution derived from N-methyl-2-pyrrolidone into cobalt-based ZIF-67 to modify the porosity and dope heteroatoms of CoS 2 nanoparticle-embedded heteroatom-doped carbon composites (CoS 2 /NSC). The mildly acidic NCQD solution resulted in the partial etching of the ZIF-67 structure, along with the deposition of NCQDs as a nitrogen source. Notably, the pore sizes could be adjusted by varying the concentration of the NCQD solution, while retaining the nitrogen functional groups during carbonization. The electrode using CoS 2 /NSC with the 2.8 mL NCQD pre-treatment exhibited enhanced C-rate capability with the capacity of 392 mAh/g at 2.0 A/g. Moreover, the cycling stability was improved, with a capacity retention of 77 % after 100 cycles. [ABSTRACT FROM AUTHOR]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 177419536
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  Label: Title
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  Data: Bifunctional effects of nitrogen-doped carbon quantum dots on CoS2/mesoporous carbon composites for high-performance lithium-ion batteries.
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  Data: <searchLink fieldCode="AR" term="%22Lee%2C+Hae+Ri%22">Lee, Hae Ri</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+Yun+Sik%22">Kim, Yun Sik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Seon+Yeong%22">Lee, Seon Yeong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Son%2C+U+Hyeok%22">Son, U Hyeok</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Sungho%22">Lee, Sungho</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Joh%2C+Han-Ik%22">Joh, Han-Ik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hijoh@konkuk.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Aug2024, Vol. 664, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Quantum+dots%22">Quantum dots</searchLink><br /><searchLink fieldCode="DE" term="%22Doping+agents+%28Chemistry%29%22">Doping agents (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium-ion+batteries%22">Lithium-ion batteries</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon%22">Carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+composites%22">Carbon composites</searchLink><br /><searchLink fieldCode="DE" term="%22Functional+groups%22">Functional groups</searchLink>
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  Label: Abstract
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  Data: [Display omitted] • Nitrogen-doped carbon dots (NCQDs) were synthesized by oxidation of NMP solvent. • NCQDs acted as both an etchant and nitrogen source on ZIF-67. • NCQDs were applied to control the porosity and the heteroatom content of CoS 2 /NSC. • CoS 2 /NSC from pre-treated ZIF-67 achieved enhanced cycling performances in LIBs. Cobalt disulfide (CoS 2) stands as a promising candidate for anode materials in lithium-ion batteries due to its high theoretical capacity, but it faces challenges associated with the shuttle effect of lithium polysulfide during cycling. To address these issues, zeolitic imidazolate framework (ZIF)-derived composites have been extensively explored because of distinct advantages such as the formation of nano-sized particles, heteroatom doping, and highly porous structures. However, ZIF-derived carbon supports primarily consist of ultra-micropores that can impede lithium-ion diffusion. Herein, we aimed to enhance cycling stability by introducing a nitrogen-doped carbon quantum dot (NCQD) solution derived from N-methyl-2-pyrrolidone into cobalt-based ZIF-67 to modify the porosity and dope heteroatoms of CoS 2 nanoparticle-embedded heteroatom-doped carbon composites (CoS 2 /NSC). The mildly acidic NCQD solution resulted in the partial etching of the ZIF-67 structure, along with the deposition of NCQDs as a nitrogen source. Notably, the pore sizes could be adjusted by varying the concentration of the NCQD solution, while retaining the nitrogen functional groups during carbonization. The electrode using CoS 2 /NSC with the 2.8 mL NCQD pre-treatment exhibited enhanced C-rate capability with the capacity of 392 mAh/g at 2.0 A/g. Moreover, the cycling stability was improved, with a capacity retention of 77 % after 100 cycles. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.apsusc.2024.160228
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        Text: English
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      – SubjectFull: Doping agents (Chemistry)
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      – SubjectFull: Lithium-ion batteries
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      – SubjectFull: Carbon
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      – SubjectFull: Carbon composites
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      – SubjectFull: Functional groups
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      – TitleFull: Bifunctional effects of nitrogen-doped carbon quantum dots on CoS2/mesoporous carbon composites for high-performance lithium-ion batteries.
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              M: 08
              Text: Aug2024
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