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Issue 36, 2017
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Modeling of internal mechanical failure of all-solid-state batteries during electrochemical cycling, and implications for battery design

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Abstract

This is the first quantitative analysis of mechanical reliability of all-solid state batteries. Mechanical degradation of the solid electrolyte (SE) is caused by intercalation-induced expansion of the electrode particles, within the constrains of a dense microstructure. A coupled electro-chemo-mechanical model was implemented to quantify the material properties that cause an SE to fracture. The treatment of microstructural details is essential to the understanding of stress-localization phenomena and fracture. A cohesive zone model is employed to simulate the evolution of damage. In the numerical tests, fracture is prevented when electrode-particle's expansion is lower than 7.5% (typical for most Li-intercalating compounds) and the solid-electrolyte's fracture energy higher than Gc = 4 J m−2. Perhaps counter-intuitively, the analyses show that compliant solid electrolytes (with Young's modulus in the order of ESE = 15 GPa) are more prone to micro-cracking. This result, captured by our non-linear kinematics model, contradicts the speculation that sulfide SEs are more suitable for the design of bulk-type batteries than oxide SEs. Mechanical degradation is linked to the battery power-density. Fracture in solid Li-ion conductors represents a barrier for Li transport, and accelerates the decay of rate performance.

Graphical abstract: Modeling of internal mechanical failure of all-solid-state batteries during electrochemical cycling, and implications for battery design

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Publication details

The article was received on 12 Apr 2017, accepted on 18 Aug 2017 and first published on 23 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA03199H
Citation: J. Mater. Chem. A, 2017,5, 19422-19430
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    Modeling of internal mechanical failure of all-solid-state batteries during electrochemical cycling, and implications for battery design

    G. Bucci, T. Swamy, Y. Chiang and W. C. Carter, J. Mater. Chem. A, 2017, 5, 19422
    DOI: 10.1039/C7TA03199H

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