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Understanding of the Electrochemical Behavior of Lithium at Bilayer-Patched Epitaxial Graphene/4H-SiC

Shtepliuk, Ivan ; Vagin, Mikhail ; Khan, Ziyauddin ; Zakharov, Alexei A. LU ; Iakimov, Tihomir ; Giannazzo, Filippo ; Ivanov, Ivan G. and Yakimova, Rositsa (2022) In Nanomaterials 12(13).
Abstract

Novel two-dimensional materials (2DMs) with balanced electrical conductivity and lithium (Li) storage capacity are desirable for next-generation rechargeable batteries as they may serve as high-performance anodes, improving output battery characteristics. Gaining an advanced understanding of the electrochemical behavior of lithium at the electrode surface and the changes in interior structure of 2DM-based electrodes caused by lithiation is a key component in the long-term process of the implementation of new electrodes into to a realistic device. Here, we showcase the advantages of bilayer-patched epitaxial graphene on 4H-SiC (0001) as a possible anode material in lithium-ion batteries. The presence of bilayer graphene patches is... (More)

Novel two-dimensional materials (2DMs) with balanced electrical conductivity and lithium (Li) storage capacity are desirable for next-generation rechargeable batteries as they may serve as high-performance anodes, improving output battery characteristics. Gaining an advanced understanding of the electrochemical behavior of lithium at the electrode surface and the changes in interior structure of 2DM-based electrodes caused by lithiation is a key component in the long-term process of the implementation of new electrodes into to a realistic device. Here, we showcase the advantages of bilayer-patched epitaxial graphene on 4H-SiC (0001) as a possible anode material in lithium-ion batteries. The presence of bilayer graphene patches is beneficial for the overall lithiation process because it results in enhanced quantum capacitance of the electrode and provides extra intercalation paths. By performing cyclic voltammetry and chronoamperometry measurements, we shed light on the redox behavior of lithium at the bilayer-patched epitaxial graphene electrode and find that the early-stage growth of lithium is governed by the instantaneous nucleation mechanism. The results also demonstrate the fast lithium-ion transport (~4.7–5.6 × 10−7 cm2·s−1) to the bilayer-patched epitaxial graphene electrode. Raman measurements complemented by in-depth statistical analysis and density functional theory calculations enable us to comprehend the lithiation effect on the properties of bilayer-patched epitaxial graphene and ascribe the lithium intercalation-induced Raman G peak splitting to the disparity between graphene layers. The current results are helpful for further advancement of the design of graphene-based electrodes with targeted performance.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
chronoamperometry, cyclic voltammetry, epitaxial graphene, lithium, Raman, SiC
in
Nanomaterials
volume
12
issue
13
article number
2229
publisher
MDPI AG
external identifiers
  • scopus:85132991690
  • pmid:35808065
ISSN
2079-4991
DOI
10.3390/nano12132229
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
id
5a4172e4-8ee4-402b-8559-db52e8089d8f
date added to LUP
2022-09-29 14:55:31
date last changed
2024-06-13 19:49:21
@article{5a4172e4-8ee4-402b-8559-db52e8089d8f,
  abstract     = {{<p>Novel two-dimensional materials (2DMs) with balanced electrical conductivity and lithium (Li) storage capacity are desirable for next-generation rechargeable batteries as they may serve as high-performance anodes, improving output battery characteristics. Gaining an advanced understanding of the electrochemical behavior of lithium at the electrode surface and the changes in interior structure of 2DM-based electrodes caused by lithiation is a key component in the long-term process of the implementation of new electrodes into to a realistic device. Here, we showcase the advantages of bilayer-patched epitaxial graphene on 4H-SiC (0001) as a possible anode material in lithium-ion batteries. The presence of bilayer graphene patches is beneficial for the overall lithiation process because it results in enhanced quantum capacitance of the electrode and provides extra intercalation paths. By performing cyclic voltammetry and chronoamperometry measurements, we shed light on the redox behavior of lithium at the bilayer-patched epitaxial graphene electrode and find that the early-stage growth of lithium is governed by the instantaneous nucleation mechanism. The results also demonstrate the fast lithium-ion transport (~4.7–5.6 × 10<sup>−7</sup> cm<sup>2·s−1</sup>) to the bilayer-patched epitaxial graphene electrode. Raman measurements complemented by in-depth statistical analysis and density functional theory calculations enable us to comprehend the lithiation effect on the properties of bilayer-patched epitaxial graphene and ascribe the lithium intercalation-induced Raman G peak splitting to the disparity between graphene layers. The current results are helpful for further advancement of the design of graphene-based electrodes with targeted performance.</p>}},
  author       = {{Shtepliuk, Ivan and Vagin, Mikhail and Khan, Ziyauddin and Zakharov, Alexei A. and Iakimov, Tihomir and Giannazzo, Filippo and Ivanov, Ivan G. and Yakimova, Rositsa}},
  issn         = {{2079-4991}},
  keywords     = {{chronoamperometry; cyclic voltammetry; epitaxial graphene; lithium; Raman; SiC}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{13}},
  publisher    = {{MDPI AG}},
  series       = {{Nanomaterials}},
  title        = {{Understanding of the Electrochemical Behavior of Lithium at Bilayer-Patched Epitaxial Graphene/4H-SiC}},
  url          = {{http://dx.doi.org/10.3390/nano12132229}},
  doi          = {{10.3390/nano12132229}},
  volume       = {{12}},
  year         = {{2022}},
}