This title appears in the Scientific Report :
2022
Please use the identifier:
http://dx.doi.org/10.1021/acsomega.2c04415 in citations.
Please use the identifier: http://hdl.handle.net/2128/33317 in citations.
Influence of the SEI formation on the stability and lithium diffusion in Si electrodes
Influence of the SEI formation on the stability and lithium diffusion in Si electrodes
Silicon (Si) is an attractive anode material for Li-ion batteries (LIBs) due to its high theoretical specific capacity. However, the solid–electrolyte interphase (SEI) formation, caused by liquid electrolyte decomposition, often befalls Si electrodes. The SEI layer is less Li-ion conductive, which w...
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Personal Name(s): | Wu, Baolin |
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Chen, Chunguang (Corresponding author) / Danilov, Dmitri L. / Jiang, Ming / Raijmakers, Luc H. J. / Eichel, Rüdiger-A. / Notten, Peter H. L. (Corresponding author) | |
Contributing Institute: |
Grundlagen der Elektrochemie; IEK-9 |
Published in: | ACS omega, 7 (2022) 36, S. 32740 - 32748 |
Imprint: |
Washington, DC
ACS Publications
2022
|
DOI: |
10.1021/acsomega.2c04415 |
Document Type: |
Journal Article |
Research Program: |
Batteries in Application |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/33317 in citations.
Silicon (Si) is an attractive anode material for Li-ion batteries (LIBs) due to its high theoretical specific capacity. However, the solid–electrolyte interphase (SEI) formation, caused by liquid electrolyte decomposition, often befalls Si electrodes. The SEI layer is less Li-ion conductive, which would significantly inhibit Li-ion transport and delay the reaction kinetics. Understanding the interaction between the SEI components and Li-ion diffusion is crucial for further improving the cycling performance of Si. Herein, different liquid electrolytes are applied to investigate the induced SEI components, structures, and their role in Li-ion transport. It is found that Si electrodes exhibit higher discharge capacities in LiClO4-based electrolytes than in LiPF6-based electrolytes. This behavior suggests that a denser and more conductive SEI layer is formed in LiClO4-based electrolytes. In addition, a coating of a Li3PO4 artificial SEI layer on Si suppresses the formation of natural SEI formation, leading to higher capacity retentions. Furthermore, galvanostatic intermittent titration technique (GITT) measurements are applied to calculate Li-ion diffusion coefficients, which are found in the range of 10–23–10–19 m2/s. |