Structure and mechanical properties of electroplated mossy lithium: Effects of current density and electrolyte

Wang, Yikai; Dang, Dingying; Xiao, Xingcheng; Cheng, Yang-Tse

doi:10.1016/j.ensm.2020.01.004

Title: Structure and mechanical properties of electroplated mossy lithium: Effects of current density and electrolyte

Journal Article · 06 January 2020 · Energy Storage Materials

DOI: https://doi.org/10.1016/j.ensm.2020.01.004 · OSTI ID:1799371

^[1];

^[2]; Xiao, Xingcheng ^[3]; Cheng, Yang-Tse ^[2]

Univ. of Kentucky, Lexington, KY (United States); OSTI
Univ. of Kentucky, Lexington, KY (United States)
General Motors Global Research and Development Center, Warren, MI (United States)

Mechanical suppression, e.g., by applying stack pressures and using functionalized coatings, has been considered a promising approach to inhibit the formation of lithium (Li) dendrites and improve the cycling stability of the Li metal electrode. However, a lack of understanding of the mechanical behavior of electroplated mossy Li, consisting of loosely packed Li dendrites that are covered by solid electrolyte interphase, hinders the development of mechanical suppression strategies and limits the understanding of the electromechanical behavior of mossy Li. In this study, we investigated, using flat punch indentation in an argon-filled glovebox, the room temperature mechanical behavior and its relationship with the microstructure of mossy Li electroplated using different current densities (between 0.25 and 10 mA/cm²) in several electrolytes. The dendrite size decreases and the porosity of mossy Li increases with increasing current density. Mossy Li has lower Young’s modulus (E) but significantly higher creep resistance than bulk Li. A scaling relationship between E and porosity is established for mossy Li. The creep behavior of mossy Li exhibits a strong size effect, i.e., the steady-state impression velocity decreases with decreasing dendrite size. These findings provide a comprehensive understanding of the relationship between the microstructure and mechanical behavior of mossy Li.

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Research Organization:: General Motors Global Research and Development Center, Warren, MI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: EE0007787

OSTI ID:: 1799371

Journal Information:: Energy Storage Materials, Journal Name: Energy Storage Materials Vol. 26; ISSN 2405-8297

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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