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On the mechanisms of stress relaxation and intensification at the lithium/solid-state electrolyte interface

Published online by Cambridge University Press:  15 November 2019

Erik G. Herbert ,
Nancy J. Dudney ,
Maria Rochow ,
Violet Thole  and
Stephen A. Hackney
Erik G. Herbert*
Affiliation:
Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
Nancy J. Dudney
Affiliation:
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
Maria Rochow
Affiliation:
Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
Violet Thole
Affiliation:
Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
Stephen A. Hackney
Affiliation:
Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
*
a)Address all correspondence to this author. e-mail: eherbert@mtu.edu
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Abstract

Under electrochemical cycling, stress intensification and relaxation within small volumes at the lithium/solid-state electrolyte (SSE) interface are thought to be critical factors contributing to mechanical failure of the SSE and subsequent short-circuiting of the device. Nanoindentation has been used to examine the diffusion-limited pressure lithium can support in the absence of active dislocation sources at high homologous temperatures. Based on the underlying physics of this deformation mechanism, a simple perturbation model coupling local current density, elastic stress, and diffusional creep relaxation is introduced. Combining this analysis with the indentation results, it is possible to describe a defect length scale which is too large for effective diffusional creep relaxation, but too small for efficient dislocation multiplication. In this instance, the properties of the SSE may become critical, and relevant indentation results of the SSE are described. The final outcome of the proposed analysis is a newly developed deformation mechanism map.

Keywords

energy storagenanoindentationdiffusion
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 34 , Issue 21 , 14 November 2019 , pp. 3593 - 3616
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

This paper has been selected as an Invited Feature Paper.

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