Enhanced strength and temperature dependence of mechanical properties of Li at small scales and its implications for Li metal anodes

Xu, Chen; Ahmad, Zeeshan; Aryanfar, Asghar; Viswanathan, Venkatasubramanian; Greer, Julia R.

doi:10.1073/pnas.1615733114

Title: Enhanced strength and temperature dependence of mechanical properties of Li at small scales and its implications for Li metal anodes

Journal Article · 19 December 2016 · Proceedings of the National Academy of Sciences of the United States of America

DOI: https://doi.org/10.1073/pnas.1615733114 · OSTI ID:1336848

^[1]; Ahmad, Zeeshan ^[2]; Aryanfar, Asghar ^[1];

^[2]; Greer, Julia R. ^[1]

Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125,
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

Significance Li metal anodes play a crucial part in next-generation Li ion and “beyond-Li ion” batteries. The issue of dendrites remains a major hurdle, and mechanical suppression through the use of solid electrolytes proves to be a promising solution. However, a lack of knowledge of mechanical properties of lithium metal at the micrometer scale limits our understanding of the mechanical interactions at the electrolyte/electrode interface. In this work, we report results on the mechanical properties of Li, specifically that Li exhibits a strong size effect at room and elevated temperature. First-principle calculations show a high level of elastic anisotropy. Based on the results, we present rational guidelines for anode/electrolyte selection and operating condition that will lead to better cycling performance.

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Research Organization:: California Inst. of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0006599

OSTI ID:: 1336848

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 1 Vol. 114; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Enhanced strength and temperature dependence of mechanical properties of Li at small scales and its implications for Li metal anodes

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