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Title: Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power

Abstract

Mechanical and electrochemical phenomena are coupled in defining the battery reliability, particularly for solid-state batteries. Micro-cracks act as barriers to Li-ion diffusion in the electrolyte, increasing the average electrode’s tortuosity. In our previous work, we showed that solid electrolytes are likely to suffer from mechanical degradation if their fracture energy is lower than 4 J m -2 [G. Bucci, T. Swamy, Y.-M. Chiang, and W. C. Carter, J. Mater. Chem. A (2017)]. Here we study the effect of electrolyte micro-cracking on the effective conductivity of composite electrodes. Via random analyzes, we predict the average diffusivity of lithium in a solid-state electrode to decrease linearly with the extension of mechanical degradation. Furthermore, the statistical distribution of first passage times indicates that the microstructure becomes more and more heterogeneous as damage progresses. In addition to power and capacity loss, a non-uniform increase of the electrode tortuosity can lead to heterogeneous lithiation and further stress localization. Finally, the understanding of these phenomena at the mesoscale is essential to the implementation of safe high-energy solid-state batteries.

Authors:
 [1];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1430228
Grant/Contract Number:  
SC0002633
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 12; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Li-ion batteries; Solid state batteries; Tortuosity

Citation Formats

Bucci, Giovanna, Swamy, Tushar, Chiang, Yet-Ming, and Carter, W. Craig. Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power. United States: N. p., 2017. Web. doi:10.1149/2.1581712jes.
Bucci, Giovanna, Swamy, Tushar, Chiang, Yet-Ming, & Carter, W. Craig. Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power. United States. doi:10.1149/2.1581712jes.
Bucci, Giovanna, Swamy, Tushar, Chiang, Yet-Ming, and Carter, W. Craig. Wed . "Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power". United States. doi:10.1149/2.1581712jes. https://www.osti.gov/servlets/purl/1430228.
@article{osti_1430228,
title = {Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power},
author = {Bucci, Giovanna and Swamy, Tushar and Chiang, Yet-Ming and Carter, W. Craig},
abstractNote = {Mechanical and electrochemical phenomena are coupled in defining the battery reliability, particularly for solid-state batteries. Micro-cracks act as barriers to Li-ion diffusion in the electrolyte, increasing the average electrode’s tortuosity. In our previous work, we showed that solid electrolytes are likely to suffer from mechanical degradation if their fracture energy is lower than 4 J m-2 [G. Bucci, T. Swamy, Y.-M. Chiang, and W. C. Carter, J. Mater. Chem. A (2017)]. Here we study the effect of electrolyte micro-cracking on the effective conductivity of composite electrodes. Via random analyzes, we predict the average diffusivity of lithium in a solid-state electrode to decrease linearly with the extension of mechanical degradation. Furthermore, the statistical distribution of first passage times indicates that the microstructure becomes more and more heterogeneous as damage progresses. In addition to power and capacity loss, a non-uniform increase of the electrode tortuosity can lead to heterogeneous lithiation and further stress localization. Finally, the understanding of these phenomena at the mesoscale is essential to the implementation of safe high-energy solid-state batteries.},
doi = {10.1149/2.1581712jes},
journal = {Journal of the Electrochemical Society},
number = 12,
volume = 164,
place = {United States},
year = {Wed Sep 06 00:00:00 EDT 2017},
month = {Wed Sep 06 00:00:00 EDT 2017}
}

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Works referenced in this record:

Progress and prospective of solid-state lithium batteries
journal, February 2013