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Improving the electrochemical properties of a SiO@C/graphite composite anode for high-energy lithium-ion batteries by adding lithium fluoride.

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Title: Improving the electrochemical properties of a SiO@C/graphite composite anode for high-energy lithium-ion batteries by adding lithium fluoride.
Authors: Xia, Mao1 (AUTHOR), Li, Yi-ran1 (AUTHOR), Wu, Yu-fan1 (AUTHOR), Zhang, Hong-bo1 (AUTHOR), Yang, Jian-kui1 (AUTHOR), Zhou, Nan1 (AUTHOR), Zhou, Zhi1 (AUTHOR) zhouzhi@hunau.edu.cn, Xiong, Xiang1 (AUTHOR) Xiongx@csu.edu.cn
Source: Applied Surface Science. Jun2019, Vol. 480, p410-418. 9p.
Subjects: Lithium fluoride, Lithium cells, Lithium-ion batteries, Superionic conductors, Chemical vapor deposition, Carbon electrodes
Abstract: Abstract Silicon monoxide has attracted wide interest as a negative material for lithium-ion batteries because of its high theoretical capacity. Moreover, in this paper, lithium fluoride serves as an additive, which can improve the initial coulombic efficiency of silicon monoxide-based electrodes. This work develops a simple two-step method to prepare a lithium fluoride-modified SiO@C/graphite composite as an anode for lithium-ion batteries. First, SiO@C is prepared via a chemical vapor deposition method; then, SiO@C/graphite-LiF is obtained by mixing SiO@C, graphite and LiF in a stirrer. The phase composition, particle appearance and electrochemical properties of the SiO@C/graphite-LiF composites are characterized via X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge and discharge analyses. The SiO@C/graphite-7.5% LiF composite shows a high capacity retention rate of over 91% after 100 cycles. The capacity of SiO@C/graphite-LiF is close to 200 mAh g−1 at 3.2 A g−1, which is much higher than that of SiO@C/graphite (only 21 mAh g−1). This result is mainly because Li ion transport is improved during the lithiation/delithiation process and stabilizes the solid electrolyte interface layer due to lithium fluoride addition. The encouraging results suggest that adding lithium fluoride to SiO-based materials is an effective strategy to improve the electrochemical properties and can be applied to high-energy storage systems. Graphical abstract Unlabelled Image Highlights • SiO@C/graphite-LiF anode material is prepared by simple two-step method. • LiF stabilizes solid electrolyte interphase (SEI) layer of SiO-based anode. • The initial coulombic efficiency can be enhanced by adding LiF. • The good performance of electrode can be attributed to the LiF additive. [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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  Label: Title
  Group: Ti
  Data: Improving the electrochemical properties of a SiO@C/graphite composite anode for high-energy lithium-ion batteries by adding lithium fluoride.
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  Data: <searchLink fieldCode="AR" term="%22Xia%2C+Mao%22">Xia, Mao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yi-ran%22">Li, Yi-ran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Yu-fan%22">Wu, Yu-fan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Hong-bo%22">Zhang, Hong-bo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Jian-kui%22">Yang, Jian-kui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Nan%22">Zhou, Nan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Zhi%22">Zhou, Zhi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhouzhi@hunau.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Xiong%2C+Xiang%22">Xiong, Xiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Xiongx@csu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Jun2019, Vol. 480, p410-418. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Lithium+fluoride%22">Lithium fluoride</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium+cells%22">Lithium cells</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium-ion+batteries%22">Lithium-ion batteries</searchLink><br /><searchLink fieldCode="DE" term="%22Superionic+conductors%22">Superionic conductors</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+vapor+deposition%22">Chemical vapor deposition</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+electrodes%22">Carbon electrodes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract Silicon monoxide has attracted wide interest as a negative material for lithium-ion batteries because of its high theoretical capacity. Moreover, in this paper, lithium fluoride serves as an additive, which can improve the initial coulombic efficiency of silicon monoxide-based electrodes. This work develops a simple two-step method to prepare a lithium fluoride-modified SiO@C/graphite composite as an anode for lithium-ion batteries. First, SiO@C is prepared via a chemical vapor deposition method; then, SiO@C/graphite-LiF is obtained by mixing SiO@C, graphite and LiF in a stirrer. The phase composition, particle appearance and electrochemical properties of the SiO@C/graphite-LiF composites are characterized via X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge and discharge analyses. The SiO@C/graphite-7.5% LiF composite shows a high capacity retention rate of over 91% after 100 cycles. The capacity of SiO@C/graphite-LiF is close to 200 mAh g−1 at 3.2 A g−1, which is much higher than that of SiO@C/graphite (only 21 mAh g−1). This result is mainly because Li ion transport is improved during the lithiation/delithiation process and stabilizes the solid electrolyte interface layer due to lithium fluoride addition. The encouraging results suggest that adding lithium fluoride to SiO-based materials is an effective strategy to improve the electrochemical properties and can be applied to high-energy storage systems. Graphical abstract Unlabelled Image Highlights • SiO@C/graphite-LiF anode material is prepared by simple two-step method. • LiF stabilizes solid electrolyte interphase (SEI) layer of SiO-based anode. • The initial coulombic efficiency can be enhanced by adding LiF. • The good performance of electrode can be attributed to the LiF additive. [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.2019.02.207
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      – Code: eng
        Text: English
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        PageCount: 9
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      – SubjectFull: Lithium fluoride
        Type: general
      – SubjectFull: Lithium cells
        Type: general
      – SubjectFull: Lithium-ion batteries
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      – SubjectFull: Superionic conductors
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      – SubjectFull: Chemical vapor deposition
        Type: general
      – SubjectFull: Carbon electrodes
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              Text: Jun2019
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