In situ measurement of biaxial modulus of Si anode for Li-ion batteries
By V. Sethuraman, M. Chon, M. Shimshak, N. V. Winkle, Pradeep R. Guduru. 2010
207 citations recorded by the source corpus.
Abstract We report in situ measurement of biaxial moduli of a Si thin-film electrode as a function of its lithium concentration. During lithiation, biaxial compressive stress is induced in the Si film and it undergoes plastic flow. At any state-of-charge (SOC), a relatively small delithiation–relithiation sequence unloads and reloads the film elastically. From the stress and strain changes during a delithiation–relithiation cycle, the biaxial modulus of the film is calculated. Stress change is obtained by measuring the change in substrate curvature using a Multi-beam Optical Sensor; the elastic strain change is obtained from the change in SOC. By repeating these measurements at several different values of SOC, the biaxial modulus was seen to decrease from ca. 70 GPa for Li 0.32 Si to ca. 35 GPa for Li 3.0 Si. Such a significant reduction in elastic modulus has important implications for modeling stress evolution and mechanical degradation in Si-based anodes.
Subfields: Atomic and Molecular Physics, and Optics, Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/57b7496aac5f4f43844d045e757d2919a5625136
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In Atomic and Molecular Physics, and Optics
- A. Bower
- L. Anand
- V. Sethuraman
- Pradeep R. Guduru
- Elisha Rejovitzky
- Claudio V. Di Leo
- Siva P. V. Nadimpalli
- Giovanna Bucci
In Automotive Engineering
- Jun Xu
- A. Bower
- Pradeep R. Guduru
- Siva P. V. Nadimpalli
- Giovanna Bucci
- Binghe Liu
- V. Sethuraman
- Elisha Rejovitzky
In Electrical and Electronic Engineering
- L. Anand
- A. Bower
- Elisha Rejovitzky
- Claudio V. Di Leo
- Pradeep R. Guduru
- Jun Xu
- V. Sethuraman
- Siva P. V. Nadimpalli
Citations in the corpus
- Diffusion–deformation theory for amorphous silicon anodes: The role of plastic deformation on electrochemical performance (2015, background): “…Li atoms, the variation of the Young’s modulus E, and the Poisson’s ratio ν, with Li concentration is taken to obey a simple rule-of-mixtures proposed by Sethuraman et al. (2012), E = aELi + (1− a)ESi, and ν = a νLi + (1− a) νSi, (3.2) where (ELi, νLi) are the elastic properties of pure Li, and…”
- Computational model of 18650 lithium-ion battery with coupled strain rate and SOC dependencies (2016, background): “In addition, nanoindentation tests were proposed to study the mechanical properties of active particles at nanoscales [27,28].”
- Measurement and modeling of the mechanical and electrochemical response of amorphous Si thin film electrodes during cyclic lithiation (2013, methodology): “Experimental measurements [22] of biaxial moduli of a Si thin-film electrode reports a decrease from around 70 GPa to about 35 GPa, as the Li fraction increases.”