This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1021/acsaem.9b01222 in citations.
Direct Observation of SEI Formation and Lithiation in Thin-Film Silicon Electrodes via in Situ Electrochemical Atomic Force Microscopy
Direct Observation of SEI Formation and Lithiation in Thin-Film Silicon Electrodes via in Situ Electrochemical Atomic Force Microscopy
Silicon (Si) has been regarded as one of the most promising anode materials to fulfill the growing demand of high performance lithium-ion batteries based on its high specific capacity. However, Si is not yet capable of replacing the widely used graphite anode due to solid–electrolyte interphase (SEI...
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Personal Name(s): | Benning, Svenja |
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Chen, Chunguang (Corresponding author) / Eichel, Rüdiger-A. / Notten, Peter H. L. / Hausen, Florian | |
Contributing Institute: |
Grundlagen der Elektrochemie; IEK-9 |
Published in: | ACS applied energy materials, 2 (2019) 9, S. 6761 - 6767 |
Imprint: |
Washington, DC
ACS Publications
2019
|
DOI: |
10.1021/acsaem.9b01222 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Electrochemical Storage |
Publikationsportal JuSER |
Silicon (Si) has been regarded as one of the most promising anode materials to fulfill the growing demand of high performance lithium-ion batteries based on its high specific capacity. However, Si is not yet capable of replacing the widely used graphite anode due to solid–electrolyte interphase (SEI) formation and extreme volume expansion during lithiation. In this work, advanced in situ electrochemical atomic force microscopy has been applied to track simultaneously the topographical evolution and mechanical properties of thin-film polycrystalline Si electrodes during SEI formation and initial lithiation. At first, a uniform flattening of the Si surface has been found, attributed to the SEI formation. This is followed by a nonuniform expansion of the individual particles upon lithiation. The experimental findings allow defining a detailed model describing the SEI layer formation and lithiation process on polycrystalline silicon thin-film electrodes. Our results support further research investigations on this promising material. |