We report the Young's modulus and deformation behavior of electroplated mossy lithium at room temperature investigated by flat punch indentation inside an argon-filled glovebox. The Young's modulus of the mossy lithium with a porosity of about 62.3% is measured to be about 2 GPa, which is smaller than that (∼7.8 GPa) of bulk lithium. Both the mossy and bulk lithium show clearly an indentation creep behavior. Despite its highly porous microstructure, the impression creep velocity of the mossy lithium is less than one-thirtieth of that of bulk lithium under the same stress. We proposed possible mechanisms for the significantly higher deformation and creep resistance of the mossy lithium over bulk lithium. These findings are key to developing mechanical suppression approaches to improve the cycling stability of lithium metal electrodes.
|Applied Physics Letters
|Published - Jul 22 2019
Bibliographical noteFunding Information:
This work was partially supported by the Vehicle Technologies Office of the U.S. Department of Energy Battery Materials Research (BMR) Program under Contract No. DE-EE0007787 and the National Science Foundation Award No. 1355438. The work performed at the University of Kentucky was also benefitted from a gift funding from Mercedes-Benz Research & Development North America, Inc. and technical discussions with Tobias Glossmann. The authors would also like to thank Dr. Stephen J. Harris of the Lawrence Berkeley National Laboratory for his insightful comments and suggestions about the manuscript.
© 2019 Author(s).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)