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Solid–electrolyte interface formation on Si Nanowires in Li-Ion batteries: The impact of electrolyte additives
Date
2023
Abstract
The morphological changes of Si nanowires (Si NWs) cycled in 1:1 ethylene–carbonate (EC)/diethyl–carbonate (DEC) with or without different additives, fluoroethylene carbonate (FEC) or vinylene carbonate (VC), as well as the composition of the deposited solid–electrolyte interphase layer, are investigated by a combination of experimental microscopic and spectroscopic techniques. Scanning electron microscopy and optical spectroscopy highlight that the NW morphology is better preserved in samples cycled in the presence of FEC and VC additives compared to the additive-free electrolyte. However, only the use of FEC is capable of slightly mitigating the amorphization of silicon upon cycling. The solid electrolyte interphase (SEI) formed over the Si NWs cycled in the additive-free electrolyte is richer in organic and inorganic carbonates compared to the SEI grown in the presence of the VC and FEC additives. Furthermore, both additives are able to remarkably limit the degradation of the LiPF6 salt. Overall, the use of the FEC-additive in the carbonate-based electrolyte promotes both morphological and structural resilience of the Si NWs upon cycling thanks to the optimal composition of the SEI layer.
Supervisor
Description
Publisher
MDPI
Citation
Batteries 2023, 9(3), 148
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Ahad_2023_Solid.pdf
Adobe PDF, 4.36 MB
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Funding Information
The authors would like to acknowledge the financial support from the European Union Horizon 2020 research and innovation program within the Si-DRIVE project, grant agreement No. 814464, and the CALIPSOplus project, grant agreement No. 730872, for the beamtimes 20210263,20201395, 20200423 and 20190616 at SOLEIL Synchrotron