Abstract
The stability and kinetics of the Li-Li7La3Zr2O12 (LLZO) interface were characterized as a function of temperature and current density. Polycrystalline LLZO was densified using a rapid hot-pressing technique achieving 97 ± 1% relative density, and <10% grain boundary resistance; effectively consisting of an ensemble of single LLZO crystals. It was determined that by heating to 175 °C, the room temperature Li-LLZO interface resistance decreases dramatically from 5822 (as-assembled) to 514 ω cm2; a > 10-fold decrease. In characterizing the maximum sustainable current density (or critical current density - CCD) of the Li-LLZO interface, several signs of degradation were observed. In DC cycling tests, significant deviation from Ohmic behavior was observed. In post-cycling tests, regions of metallic Li were observed; propagating parallel to the ionic current. For the cells cycled at 30, 70, 100, 130 and 160 °C, the CCD was determined to be 50, 200, 800, 3500, and 20000 μA cm-2, respectively. The relationships and phenomena observed in this work can be used to better understand the Li-LLZO interface stability, enabling the use of batteries employing Li metal anodes.
Original language | English |
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Pages (from-to) | 135-139 |
Number of pages | 5 |
Journal | Journal of Power Sources |
Volume | 302 |
DOIs | |
State | Published - Jan 20 2016 |
Funding
AS and JS would like to acknowledge support from the Advanced Research Projects Agency-Energy and Solid Power LLC (Award DE-AR0000399 ), and AS, HM, JN, JW, and JS would like to acknowledge support from the Battery Materials Research Program, Department of Energy (Award DE-EE-00006821 ). We would also like to thank Dr. Nancy Dudney at the Oak Ridge National Laboratory for her helpful discussions.
Funders | Funder number |
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Advanced Research Projects Agency-Energy and Solid Power LLC | DE-AR0000399 |
U.S. Department of Energy | DE-EE-00006821 |
Keywords
- Charge transfer
- Current density
- Li
- Solid state electrolyte