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N/S Co-Doped Carbon-Coated Micro-Expanded Graphite for High-Performance Lithium-Ion Battery Anodes.

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Title: N/S Co-Doped Carbon-Coated Micro-Expanded Graphite for High-Performance Lithium-Ion Battery Anodes.
Authors: Wang, Wenjie1,2 (AUTHOR), Zhang, Xuan2,3 (AUTHOR), Wang, Xianchao3 (AUTHOR), Gao, Chengwei4 (AUTHOR) zhangxuan@cnbm.com.cn, Yin, Jinling1,2 (AUTHOR), Wen, Qing1,2 (AUTHOR) gaochengwei1006@163.com, Wang, Guiling1,2,3 (AUTHOR)
Source: Materials (1996-1944). Jun2025, Vol. 18 Issue 11, p2477. 21p.
Subjects: Graphite composites, Lithium ions, Solid electrolytes, Fulvic acids, Charge transfer
Abstract: Natural graphite (NG) is abundant and has a high capacity for lithium-ion storage, but its narrow interlayer spacing and poor cyclic stability limit its use in high-performance lithium-ion batteries (LIBs). To address this, a N/S co-doped micro-expanded graphite composite (BFAC@MEG) was prepared by coating micro-expanded graphite (MEG) with N/S-containing amorphous carbon derived from biochemical fulvic acid (BFAC). This enhanced the electrochemical kinetics of lithium ions, improving charge transfer rates and reducing diffusion resistance. GITT results showed a higher Li+ diffusion coefficient than MEG and spherical graphite (SG). BFAC@MEG exhibited excellent rate performance, robust storage capacity and remarkable cycling stability. It had a specific capacity of 333 mAh g−1 at 1 C, 205 mAh g−1 at 3 C, and retained 81.57% capacity after 500 cycles. Even at 5 C, BFAC@MEG exhibits a high reversible capacity of 98 mAh g−1 after 200 cycles. After cycling, SEM and XPS analyses revealed a low expansion rate of 15.96% cross-sectional expansion after 300 cycles at 3 C and a stable solid electrolyte interphase (SEI) film rich in LiF and Li2CO3. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI 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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  Label: Title
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  Data: N/S Co-Doped Carbon-Coated Micro-Expanded Graphite for High-Performance Lithium-Ion Battery Anodes.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Wenjie%22">Wang, Wenjie</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Xuan%22">Zhang, Xuan</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Xianchao%22">Wang, Xianchao</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gao%2C+Chengwei%22">Gao, Chengwei</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> zhangxuan@cnbm.com.cn</i><br /><searchLink fieldCode="AR" term="%22Yin%2C+Jinling%22">Yin, Jinling</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wen%2C+Qing%22">Wen, Qing</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> gaochengwei1006@163.com</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Guiling%22">Wang, Guiling</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Jun2025, Vol. 18 Issue 11, p2477. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Graphite+composites%22">Graphite composites</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium+ions%22">Lithium ions</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+electrolytes%22">Solid electrolytes</searchLink><br /><searchLink fieldCode="DE" term="%22Fulvic+acids%22">Fulvic acids</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+transfer%22">Charge transfer</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Natural graphite (NG) is abundant and has a high capacity for lithium-ion storage, but its narrow interlayer spacing and poor cyclic stability limit its use in high-performance lithium-ion batteries (LIBs). To address this, a N/S co-doped micro-expanded graphite composite (BFAC@MEG) was prepared by coating micro-expanded graphite (MEG) with N/S-containing amorphous carbon derived from biochemical fulvic acid (BFAC). This enhanced the electrochemical kinetics of lithium ions, improving charge transfer rates and reducing diffusion resistance. GITT results showed a higher Li+ diffusion coefficient than MEG and spherical graphite (SG). BFAC@MEG exhibited excellent rate performance, robust storage capacity and remarkable cycling stability. It had a specific capacity of 333 mAh g−1 at 1 C, 205 mAh g−1 at 3 C, and retained 81.57% capacity after 500 cycles. Even at 5 C, BFAC@MEG exhibits a high reversible capacity of 98 mAh g−1 after 200 cycles. After cycling, SEM and XPS analyses revealed a low expansion rate of 15.96% cross-sectional expansion after 300 cycles at 3 C and a stable solid electrolyte interphase (SEI) film rich in LiF and Li2CO3. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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: 10.3390/ma18112477
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      – Code: eng
        Text: English
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        PageCount: 21
        StartPage: 2477
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      – SubjectFull: Graphite composites
        Type: general
      – SubjectFull: Lithium ions
        Type: general
      – SubjectFull: Solid electrolytes
        Type: general
      – SubjectFull: Fulvic acids
        Type: general
      – SubjectFull: Charge transfer
        Type: general
    Titles:
      – TitleFull: N/S Co-Doped Carbon-Coated Micro-Expanded Graphite for High-Performance Lithium-Ion Battery Anodes.
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            NameFull: Wang, Wenjie
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            NameFull: Zhang, Xuan
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            NameFull: Wang, Xianchao
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            NameFull: Gao, Chengwei
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            NameFull: Yin, Jinling
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            NameFull: Wen, Qing
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            NameFull: Wang, Guiling
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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              Value: 18
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              Value: 11
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            – TitleFull: Materials (1996-1944)
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