In Situ Measurements of Stress-Potential Coupling in Lithiated Silicon
By V. Sethuraman, Venkat Srinivasan, A. Bower, Pradeep R. Guduru. 2010
360 citations recorded by the source corpus.
An analysis of the dependence of electric potential on the state of stress of a lithiated-silicon electrode is presented. Based on the Larche and Cahn chemical potential for a solid solution, a thermodynamic argument is made for the existence of the stresspotential coupling in lithiated silicon; based on the known properties of the material, the magnitude of the coupling is estimated to be 60 mV/GPa in thin-film geometry. An experimental investigation is carried out on silicon thin-film electrodes in which the stress is measured in situ during electrochemical lithiation and delithiation. By progressively varying the stress through incremental delithiation, the relation between stress change and electric-potential change is measured to be 100–120 mV/GPa, which is of the same order of magnitude as the prediction of the analysis. The importance of the coupling is discussed in interpreting the hysteresis observed in the potential vs state-of-charge plots and the role of stress in modifying the maximum charge capacity of a silicon electrode under stress.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1611242802e0a8c8e79432b9d9a861308a1b1ce8
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In Electrical and Electronic Engineering
- Sulin Zhang
- L. Anand
- A. Bower
- Elisha Rejovitzky
- Claudio V. Di Leo
- Pradeep R. Guduru
- V. Sethuraman
- Siva P. V. Nadimpalli
In Materials Chemistry
Citations in the corpus
- Diffusion–deformation theory for amorphous silicon anodes: The role of plastic deformation on electrochemical performance (2015, methodology): “denoting the atomic fraction of 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.”
- Electrochemomechanical degradation of high-capacity battery electrode materials (2017, methodology): “This curvature method has been utilized to measure the stress evolution in LiCoO2 and LiMn2O4 cathode [81,82] and more recently in amorphous Si (a-Si) thin-film anodes [83,84].”
- A finite strain model of stress, diffusion, plastic flow, and electrochemical reactions in a lithium-ion half-cell (2011, background): “Equations (18) then relate the rate of change of potential difference across the interface to the concentration of electrons Q and Li+, AR + , in the interface as 3 0 0 ( ) FA a aA A A A FA eN a dH eN adQ dR dQd dt dt dt dt dt φ φ ε ε +⎛ ⎞ ⎜ ⎟− = − = − ⎜ ⎟ ⎝ ⎠ (87) 28 where 3, FA FA Hφ denote the ”