Lithium Mechanics: Roles of Strain Rate and Temperature and Implications for Lithium Metal Batteries
By W. LePage, Yuxin Chen, E. Kazyak, Kuan-Hung Chen, Adrian J. Sanchez, Andrea Poli, E. Arruda, Michael D. Thouless, N. Dasgupta. Journal of the Electrochemical Society, 2019
283 citations recorded by the source corpus.
The lack of a reliable rechargeable lithium metal (Li-metal) anode is a critical bottleneck for next-generation batteries. The unique mechanical properties of lithium influence the dynamic evolution of Li-metal anodes during cycling. While recent models have aimed at understanding the coupled electrochemical-mechanical behavior of Li-metal anodes, there is a lack of rigorous experimental data on the bulk mechanical properties of Li. This work provides comprehensive mechanical measurements of Li using a combination of digital-image correlation and tensile testing in inert gas environments. The deformation of Li was measured over a wide range of strain rates and temperatures, and it was fitted to a power-law creep model. Strain hardening was only observed at high strain rates and low temperatures, and creep was the dominant deformation mechanism over a wide range of battery-relevant conditions. To contextualize the role of creep on Li-metal anode behavior, examples are discussed for solid-state batteries, “dead” Li, and protective coatings on Li anodes. This work suggests new research directions and can be used to inform future electrochemical-mechanical models of Li-metal anodes.
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/44335b2ee5779a26877d767a1437855bbd2a5fd2
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Citations in the corpus
- Rethinking How External Pressure Can Suppress Dendrites in Lithium Metal Batteries (2019, background): “3 Li properties Li metal was treated as an elastic-perfectly-plastic material, which is valid[65] for low strain rates (≤ 3 × 10s ).”
- Characterizing the Li-Solid-Electrolyte Interface Dynamics as a Function of Stack Pressure and Current Density (2019, background): “For example, after 5 h and based on the data from Masias et al., the strain rate decays by a factor of approximately 10 3–10 4.26 Using the values provided by LePage et al. and Masias et al., the strain-rate at the end of each pressure step can be calculated, assuming a decay of 10 4 due to friction”