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Enhancing crystallinity of recycled carbon fibers by synergistic role of alkaline salts and CaCO3 for lithium-ion batteries.

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Title: Enhancing crystallinity of recycled carbon fibers by synergistic role of alkaline salts and CaCO3 for lithium-ion batteries.
Authors: Lee, Hae Ri1 (AUTHOR), Lee, Gwanwon1 (AUTHOR), Lee, Sora1 (AUTHOR), Oh, Yubin2 (AUTHOR), Joh, Han-Ik2 (AUTHOR), Cho, Se Youn1,3 (AUTHOR) seyoucho@kist.re.kr, Lee, Sungho1,3,4 (AUTHOR) sunghol@kist.re.kr
Source: Carbon. Feb2026, Vol. 247, pN.PAG-N.PAG. 1p.
Subjects: Lithium-ion batteries, Crystallinity, Calcium carbonate, Electrochemical apparatus, Alkalies, Carbon fibers, Electrodes
Abstract: Carbon fibers (CFs) have been developed for use in various fields including sport, aerospace, and electrochemical storages, due to its multifunctional properties such as high mechanical strength, electrical conductivity, and lightweight nature. However, their intrinsically disordered, non-graphitizable structure limits their application as anode materials in lithium-ion batteries (LIBs). In this study, we introduce a catalyst-assisted thermal treatment strategy to enhance the crystallinity and electrochemical performance of recycled CFs (rCFs). A binary mixture of calcium carbonate (CaCO 3) and potassium hydroxide (KOH) was applied to the rCF surface prior to one-step carbonization at 1600 °C. KOH effectively removes amorphous carbon, while CaCO 3 promotes the growth of graphitic domains. The synergistic effect led to significantly improved structural ordering. The rCF treated with the CaCO 3 and KOH mixture (CaCF–KOH) exhibited a significant increase in capacity to 284 mAh g−1, compared to untreated rCF (175 mAh g−1) and rCF treated with CaCO 3 alone (189 mAh g−1). Furthermore, CaCF–KOH demonstrated enhanced cycling stability, maintaining 102 % of its initial capacity after 500 cycles. These results highlight the effectiveness of the catalyst-assisted carbonization pathway in tailoring the microstructure of rCFs and underscore the potential of the optimized rCF as a high-performance, structurally stable anode material for next-generation LIBs. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Carbon 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 189847821
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Enhancing crystallinity of recycled carbon fibers by synergistic role of alkaline salts and CaCO3 for 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="%22Lee%2C+Gwanwon%22">Lee, Gwanwon</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Sora%22">Lee, Sora</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Oh%2C+Yubin%22">Oh, Yubin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Joh%2C+Han-Ik%22">Joh, Han-Ik</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cho%2C+Se+Youn%22">Cho, Se Youn</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> seyoucho@kist.re.kr</i><br /><searchLink fieldCode="AR" term="%22Lee%2C+Sungho%22">Lee, Sungho</searchLink><relatesTo>1,3,4</relatesTo> (AUTHOR)<i> sunghol@kist.re.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Carbon%22">Carbon</searchLink>. Feb2026, Vol. 247, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Lithium-ion+batteries%22">Lithium-ion batteries</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallinity%22">Crystallinity</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+carbonate%22">Calcium carbonate</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+apparatus%22">Electrochemical apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22Alkalies%22">Alkalies</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+fibers%22">Carbon fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Electrodes%22">Electrodes</searchLink>
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  Data: Carbon fibers (CFs) have been developed for use in various fields including sport, aerospace, and electrochemical storages, due to its multifunctional properties such as high mechanical strength, electrical conductivity, and lightweight nature. However, their intrinsically disordered, non-graphitizable structure limits their application as anode materials in lithium-ion batteries (LIBs). In this study, we introduce a catalyst-assisted thermal treatment strategy to enhance the crystallinity and electrochemical performance of recycled CFs (rCFs). A binary mixture of calcium carbonate (CaCO 3) and potassium hydroxide (KOH) was applied to the rCF surface prior to one-step carbonization at 1600 °C. KOH effectively removes amorphous carbon, while CaCO 3 promotes the growth of graphitic domains. The synergistic effect led to significantly improved structural ordering. The rCF treated with the CaCO 3 and KOH mixture (CaCF–KOH) exhibited a significant increase in capacity to 284 mAh g−1, compared to untreated rCF (175 mAh g−1) and rCF treated with CaCO 3 alone (189 mAh g−1). Furthermore, CaCF–KOH demonstrated enhanced cycling stability, maintaining 102 % of its initial capacity after 500 cycles. These results highlight the effectiveness of the catalyst-assisted carbonization pathway in tailoring the microstructure of rCFs and underscore the potential of the optimized rCF as a high-performance, structurally stable anode material for next-generation LIBs. [Display omitted] [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Carbon 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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RecordInfo BibRecord:
  BibEntity:
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      – Type: doi
        Value: 10.1016/j.carbon.2025.121042
    Languages:
      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
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      – SubjectFull: Lithium-ion batteries
        Type: general
      – SubjectFull: Crystallinity
        Type: general
      – SubjectFull: Calcium carbonate
        Type: general
      – SubjectFull: Electrochemical apparatus
        Type: general
      – SubjectFull: Alkalies
        Type: general
      – SubjectFull: Carbon fibers
        Type: general
      – SubjectFull: Electrodes
        Type: general
    Titles:
      – TitleFull: Enhancing crystallinity of recycled carbon fibers by synergistic role of alkaline salts and CaCO3 for lithium-ion batteries.
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            NameFull: Lee, Hae Ri
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            NameFull: Lee, Gwanwon
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            NameFull: Lee, Sora
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            NameFull: Oh, Yubin
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            NameFull: Joh, Han-Ik
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 247
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            – TitleFull: Carbon
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