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Blocking Lithium Dendrite Growth in Solid-State Batteries with an Ultrathin Amorphous Li-La-Zr-O Solid Electrolyte

preprint
revised on 07.02.2021, 13:30 and posted on 08.02.2021, 10:33 by Jordi Sastre, Moritz H. Futscher, Lea Pompizi, Abdessalem Aribia, Agnieszka Priebe, Jan Overbeck, Michael Stiefel, Ayodhya N. Tiwari, Yaroslav E. Romanyuk
Lithium metal dendrites have become a roadblock in the realization of next-generation solid-state batteries with lithium metal as high-capacity anode. The presence of surface and bulk inhomogeneities with non-negligible electronic conductivity in crystalline electrolytes such as the lithium garnet Li7La3Zr2O12 (LLZO) facilitates the growth of lithium filaments, posing a critical safety risk. Here we explore the amorphous phase of LLZO (aLLZO) as a lithium dendrite shield owing to its grain-boundary-free microstructure, stability against metallic lithium, and high electronic insulation. We demonstrate that by tuning the lithium stoichiometry in sputtered aLLZO films, the ionic conductivity can be increased up to 10-7 S cm-1 while retaining an ultralow electronic conductivity of 10-14 S cm-1. In Li/aLLZO/Li symmetric cells, plating-stripping results in no degradation of the films and current densities up to 3.2 mA cm-2 can be applied with no signs of lithium penetration. The defect-free and conformal nature of the films enables microbatteries with an electrolyte thickness as low as 70 nm, which withstand charge-discharge at 0.2 mA cm-2 for over 500 cycles. Finally, we demonstrate that the application of aLLZO as a coating on crystalline LLZO lowers the interface resistance and significantly impedes the formation of lithium dendrites, increasing the critical current density of a symmetric cell up to 1.3 mA cm-2 at room temperature and without external pressure. The effectiveness of the amorphous Li-La-Zr-O as lithium dendrite blocking layer can accelerate the development of more powerful and safer solid-state batteries.

Funding

Swiss National Science Foundation (grant number 200021_172764)

Empa-Fraunhofer ISC project "IE4B" under the ICON funding line

Strategic Focus Area (SFA) Advanced Manufacturing of the ETH Domain (project "X-Ray Diagnostics")

Empa internal project "SUISSE-battery"

History

Email Address of Submitting Author

jordi.sastrepellicer@empa.ch

Institution

Empa - Swiss Federal Laboratories for Materials Science and Technology

Country

Switzerland

ORCID For Submitting Author

0000-0003-0866-0911

Declaration of Conflict of Interest

The authors declare that there is no conflict of interest

Version Notes

Pre-submission version

Exports