Direct observation of SEI formation and lithiation in thin-film silicon electrodes via in-situ electrochemical atomic force microscopy

Svenja Benning, Chunguang Chen (Corresponding author), Rüdiger A. Eichel, Peter Notten, Florian Hausen

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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 non-uniform 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.
LanguageEnglish
Pages6761-6767
Number of pages7
JournalACS Applied Energy Materials
Volume2
Issue number9
DOIs
StateE-pub ahead of print - 30 Aug 2019

Fingerprint

solid electrolytes
atomic force microscopy
electrodes
silicon
thin films
anodes
expansion
flattening
electric batteries
graphite
lithium
mechanical properties
ions

Keywords

  • atomic force microscopy
  • Si anode
  • solid−electrolyte interphase
  • thin film
  • in situ characterization

Cite this

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title = "Direct observation of SEI formation and lithiation in thin-film silicon electrodes via in-situ electrochemical atomic force microscopy",
abstract = "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 non-uniform 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.",
keywords = "atomic force microscopy, Si anode, solid−electrolyte interphase, thin film, in situ characterization",
author = "Svenja Benning and Chunguang Chen and Eichel, {R{\"u}diger A.} and Peter Notten and Florian Hausen",
year = "2019",
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Direct observation of SEI formation and lithiation in thin-film silicon electrodes via in-situ electrochemical atomic force microscopy. / Benning, Svenja; Chen, Chunguang (Corresponding author); Eichel, Rüdiger A.; Notten, Peter; Hausen, Florian.

In: ACS Applied Energy Materials, Vol. 2, No. 9, 30.08.2019, p. 6761-6767.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Direct observation of SEI formation and lithiation in thin-film silicon electrodes via in-situ electrochemical atomic force microscopy

AU - Benning,Svenja

AU - Chen,Chunguang

AU - Eichel,Rüdiger A.

AU - Notten,Peter

AU - Hausen,Florian

PY - 2019/8/30

Y1 - 2019/8/30

N2 - 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 non-uniform 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.

AB - 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 non-uniform 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.

KW - atomic force microscopy

KW - Si anode

KW - solid−electrolyte interphase

KW - thin film

KW - in situ characterization

U2 - 10.1021/acsaem.9b01222

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T2 - ACS Applied Energy Materials

JF - ACS Applied Energy Materials

SN - 2574-0962

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