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Title: Mechano-Electrochemical Interaction Gives Rise to Strain Relaxation in Sn Electrodes

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0801614jes· OSTI ID:1436481

Tin (Sn) anode active particles were electrochemically lithiated during simultaneous imaging in a scanning electron microscope. Relationships among the reaction mechanism, active particle local strain rate, particle size, and microcrack formation are elucidated to demonstrate the importance of strain relaxation due to mechano-electrochemical interaction in Sn-based electrodes under electrochemical cycling. At low rates of operation, due to significant creep relaxation, large Sn active particles, of size 1 μm, exhibit no significant surface crack formation. Microcrack formation within Sn active particles occurs due to two different mechanisms: (i)large concentration gradient induced stress at the two-phase interface, and (ii) high volume expansion induced stress at the surface of the active particles. From the present study, it can be concluded that majority of the microcracks evolve at or near the particle surface due to high volume expansion induced tension. Concentration gradient induced damage prevails near the center of the active particle, though significantly smaller in magnitude. Comparison with experimental results indicates that at operating conditions of C/2, even 500 nm sized Sn active particles remain free from surface crack formation, which emphasizes the importance of creep relaxation. A phase map has been developed to demonstrate the preferred mechano-electrochemical window of operation of Sn-based electrodes.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0006509
OSTI ID:
1436481
Alternate ID(s):
OSTI ID: 1436479
Journal Information:
Journal of the Electrochemical Society, Vol. 163, Issue 14; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (9)

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This electrode is best served cold—a reversible electrochemical lithiation of a gray cubic tin journal June 2018
Lithium effect on the electronic properties of porous silicon for energy storage applications: a DFT study journal January 2018
Effect of Li concentration-dependent material properties on diffusion induced stresses of a Sn anode journal January 2019
Review—Electrolytic Metal Atoms Enabled Manufacturing of Nanostructured Sensor Electrodes journal January 2020
Effects of Commonly Evolved Solid-Electrolyte-Interphase (SEI) Reaction Product Gases on the Cycle Life of Li-Ion Full Cells journal January 2018
Mechanistic Elucidation of Si Particle Morphology on Electrode Performance journal January 2019
Understanding the Mechanism of Stress Mitigation in Selenium-Doped Germanium Electrodes journal January 2019
Mechano-Electrochemical Interaction and Degradation in Graphite Electrode with Surface Film journal January 2018

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