A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage
The solid electrolyte interface (SEI) significantly affects alkaline metal ion battery performance in terms of reversible capacity, Coulombic efficiency, and cycling stability. However, intrinsic properties of SEI layer in potassium ion batteries (KIBs), including structures, components, formation m...
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sg-ntu-dr.10356-1499732023-02-28T19:57:36Z A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage Wang, Huanhuan Wang, Haisheng Chen, Shi Zhang, Bowei Yang, Guang Gao, Peng Liu, Jilei Fan, Xaiofeng Huang, Yizhong Lin, Jianyi Shen, Zexiang School of Materials Science and Engineering School of Physical and Mathematical Sciences CNRS International NTU THALES Research Alliances Engineering::Materials Solid Electrolyte Interphase Bis(fluorosulfuryl)imide The solid electrolyte interface (SEI) significantly affects alkaline metal ion battery performance in terms of reversible capacity, Coulombic efficiency, and cycling stability. However, intrinsic properties of SEI layer in potassium ion batteries (KIBs), including structures, components, formation mechanism, and corresponding K+ storage behavior, are poorly understood. Here, we focus on the effect of electrolyte on SEI formation and K+ storage behavior in self-supported nitrogen-doped graphite foams (NGFs). Two types of organic electrolytes, KPF6 and KN(SO2F)2 (KFSI) salt in EC/DEC solution, were carefully selected and compared in detail to reveal the effect of SEI on the K+ ion storage mechanism. The experimental results, including in situ electrochemical evaluations and depth-profiling XPS analysis, demonstrate that the salts of KFSI result in a more uniform, stable, and thinner SEI layer compared with the SEI induced by KPF6. Particularly, the KFSI-induced SEI is rich in stable and uniformly distributed inorganic species and polycarbonates, whereas the KPF6-induced SEI is mainly composed of instable alkyl carbonates. This could be attributed to the larger FSI– size over PF6– and lower LUMO levels than solvents according to theoretical calculations, which effectively prevent SEI from co-intercalation damage, thus leading to high stability of the as-obtained SEI layer. In general, the above-mentioned features could ensure high reversibility and good cycling stability of the self-supported NGFs electrode in KFSI-based electrolyte. Ministry of Education (MOE) Accepted version The authors acknowledge the financial support from the Ministry of Education (MOE) AcRF Tier 3 [MOE2011-T3-1- 005], the Young Scientists Fund of the National Natural Science Foundation of China [Grants 51802091, 11504123, and 51627805], and the National Youth Thousand Talents Program [Grant 531109200024]. We also acknowledge the Facility for Analysis, Characterization, Testing and Simulation, Nanyang Technological University, Singapore, for use of their field emission Auger microprobe (JEOL JAMP-7830F). 2021-05-19T05:23:50Z 2021-05-19T05:23:50Z 2019 Journal Article Wang, H., Wang, H., Chen, S., Zhang, B., Yang, G., Gao, P., Liu, J., Fan, X., Huang, Y., Lin, J. & Shen, Z. (2019). A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage. ACS Applied Energy Materials, 2(11), 7942-7951. https://dx.doi.org/10.1021/acsaem.9b01428 2574-0962 0000-0003-0571-323X 0000-0001-6288-4866 0000-0003-2644-856X 0000-0001-7432-7936 https://hdl.handle.net/10356/149973 10.1021/acsaem.9b01428 2-s2.0-85074857425 11 2 7942 7951 en MOE2011-T3-1- 005 ACS Applied Energy Materials This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaem.9b01428 application/pdf |
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Engineering::Materials Solid Electrolyte Interphase Bis(fluorosulfuryl)imide Wang, Huanhuan Wang, Haisheng Chen, Shi Zhang, Bowei Yang, Guang Gao, Peng Liu, Jilei Fan, Xaiofeng Huang, Yizhong Lin, Jianyi Shen, Zexiang A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage |
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The solid electrolyte interface (SEI) significantly affects alkaline metal ion battery performance in terms of reversible capacity, Coulombic efficiency, and cycling stability. However, intrinsic properties of SEI layer in potassium ion batteries (KIBs), including structures, components, formation mechanism, and corresponding K+ storage behavior, are poorly understood. Here, we focus on the effect of electrolyte on SEI formation and K+ storage behavior in self-supported nitrogen-doped graphite foams (NGFs). Two types of organic electrolytes, KPF6 and KN(SO2F)2 (KFSI) salt in EC/DEC solution, were carefully selected and compared in detail to reveal the effect of SEI on the K+ ion storage mechanism. The experimental results, including in situ electrochemical evaluations and depth-profiling XPS analysis, demonstrate that the salts of KFSI result in a more uniform, stable, and thinner SEI layer compared with the SEI induced by KPF6. Particularly, the KFSI-induced SEI is rich in stable and uniformly distributed inorganic species and polycarbonates, whereas the KPF6-induced SEI is mainly composed of instable alkyl carbonates. This could be attributed to the larger FSI– size over PF6– and lower LUMO levels than solvents according to theoretical calculations, which effectively prevent SEI from co-intercalation damage, thus leading to high stability of the as-obtained SEI layer. In general, the above-mentioned features could ensure high reversibility and good cycling stability of the self-supported NGFs electrode in KFSI-based electrolyte. |
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School of Materials Science and Engineering |
author_facet |
School of Materials Science and Engineering Wang, Huanhuan Wang, Haisheng Chen, Shi Zhang, Bowei Yang, Guang Gao, Peng Liu, Jilei Fan, Xaiofeng Huang, Yizhong Lin, Jianyi Shen, Zexiang |
format |
Article |
author |
Wang, Huanhuan Wang, Haisheng Chen, Shi Zhang, Bowei Yang, Guang Gao, Peng Liu, Jilei Fan, Xaiofeng Huang, Yizhong Lin, Jianyi Shen, Zexiang |
author_sort |
Wang, Huanhuan |
title |
A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage |
title_short |
A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage |
title_full |
A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage |
title_fullStr |
A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage |
title_full_unstemmed |
A depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved K+ storage |
title_sort |
depth-profiling study on the solid electrolyte interface : bis(fluorosulfuryl)imide anion toward improved k+ storage |
publishDate |
2021 |
url |
https://hdl.handle.net/10356/149973 |
_version_ |
1759854348647530496 |