Impact of air exposure and surface chemistry on Li-Li7La3Zr2O12 interfacial resistance
Abstract
Li7La3Zr2O12 (LLZO) is a promising solid-state electrolyte that could enable solid-state-batteries (SSB) employing metallic Li anodes. For a SSB to be viable, the stability and charge transfer kinetics at the Li–LLZO interface should foster facile plating and stripping of Li. Contrary to these goals, recent studies have reported high Li–LLZO interfacial resistance which was attributed to a contamination layer that forms upon exposure of LLZO to air. This study clarifies the mechanisms and consequences associated with air exposure of LLZO; additionally, strategies to minimize these effects are described. First-principles calculations reveal that LLZO readily reacts with humid air; the most favorable reaction pathway involves protonation of LLZO and formation of Li2CO3. X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy, and transmission electron microscopy were used to characterize the surface and subsurface chemistry of LLZO as a function of relative humidity and exposure time. Additionally, electrochemical impedance spectroscopy was used to measure the Li–LLZO interfacial resistance as a function of surface contamination. These data indicate that air exposure-induced contamination impacts the interfacial resistance significantly, when exposure time exceeds 24 h. The results of this study provide valuable insight into the sensitivity of LLZO to air and how the effects of airmore »
- Authors:
-
- Univ. of Michigan, Ann Arbor, MI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1394429
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry. A
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 26; Journal ID: ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Sharafi, Asma, Yu, Seungho, Naguib, Michael, Lee, Marcus, Ma, Cheng, Meyer, Harry M., Nanda, Jagjit, Chi, Maiofang, Siegel, Donald J., and Sakamoto, Jeff. Impact of air exposure and surface chemistry on Li-Li7La3Zr2O12 interfacial resistance. United States: N. p., 2017.
Web. doi:10.1039/C7TA03162A.
Sharafi, Asma, Yu, Seungho, Naguib, Michael, Lee, Marcus, Ma, Cheng, Meyer, Harry M., Nanda, Jagjit, Chi, Maiofang, Siegel, Donald J., & Sakamoto, Jeff. Impact of air exposure and surface chemistry on Li-Li7La3Zr2O12 interfacial resistance. United States. https://doi.org/10.1039/C7TA03162A
Sharafi, Asma, Yu, Seungho, Naguib, Michael, Lee, Marcus, Ma, Cheng, Meyer, Harry M., Nanda, Jagjit, Chi, Maiofang, Siegel, Donald J., and Sakamoto, Jeff. Thu .
"Impact of air exposure and surface chemistry on Li-Li7La3Zr2O12 interfacial resistance". United States. https://doi.org/10.1039/C7TA03162A. https://www.osti.gov/servlets/purl/1394429.
@article{osti_1394429,
title = {Impact of air exposure and surface chemistry on Li-Li7La3Zr2O12 interfacial resistance},
author = {Sharafi, Asma and Yu, Seungho and Naguib, Michael and Lee, Marcus and Ma, Cheng and Meyer, Harry M. and Nanda, Jagjit and Chi, Maiofang and Siegel, Donald J. and Sakamoto, Jeff},
abstractNote = {Li7La3Zr2O12 (LLZO) is a promising solid-state electrolyte that could enable solid-state-batteries (SSB) employing metallic Li anodes. For a SSB to be viable, the stability and charge transfer kinetics at the Li–LLZO interface should foster facile plating and stripping of Li. Contrary to these goals, recent studies have reported high Li–LLZO interfacial resistance which was attributed to a contamination layer that forms upon exposure of LLZO to air. This study clarifies the mechanisms and consequences associated with air exposure of LLZO; additionally, strategies to minimize these effects are described. First-principles calculations reveal that LLZO readily reacts with humid air; the most favorable reaction pathway involves protonation of LLZO and formation of Li2CO3. X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy, and transmission electron microscopy were used to characterize the surface and subsurface chemistry of LLZO as a function of relative humidity and exposure time. Additionally, electrochemical impedance spectroscopy was used to measure the Li–LLZO interfacial resistance as a function of surface contamination. These data indicate that air exposure-induced contamination impacts the interfacial resistance significantly, when exposure time exceeds 24 h. The results of this study provide valuable insight into the sensitivity of LLZO to air and how the effects of air contamination can be reversed.},
doi = {10.1039/C7TA03162A},
journal = {Journal of Materials Chemistry. A},
number = 26,
volume = 5,
place = {United States},
year = {Thu Jun 15 00:00:00 EDT 2017},
month = {Thu Jun 15 00:00:00 EDT 2017}
}
Web of Science
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