Nanostructured metal carbides for aprotic Li-O 2 batteries. New insights into interfacial reactions and cathode stability
Abstract
The development of nonaqueous Li–oxygen batteries, which relies on the reversible reaction of Li + O 2 to give lithium peroxide (Li 2O 2), is challenged by several factors, not the least being the high charging voltage that results when carbon is typically employed as the cathode host. We report here on the remarkably low 3.2 V potential for Li 2O 2 oxidation on a passivated nanostructured metallic carbide (Mo 2C), carbon-free cathode host. Furthermore, online mass spectrometry coupled with X-ray photoelectron spectroscopy unequivocally demonstrates that lithium peroxide is simultaneously oxidized together with the Li xMoO 3-passivated conductive interface formed on the carbide, owing to their close redox potentials. We found that the process rejuvenates the surface on each cycle upon electrochemical charge by releasing Li xMoO 3 into the electrolyte, explaining the low charging potential.
- Authors:
-
- Univ. of Waterloo, ON (Canada)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1235282
- Report Number(s):
- SAND-2015-4343J
Journal ID: ISSN 1948-7185; 590459
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry Letters
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 12; Journal ID: ISSN 1948-7185
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; lithium-air; oxygen reduction; aprotic medial online mass spectrometry
Citation Formats
Kundu, Dipan, Black, Robert, Adams, Brian, Harrison, Katharine, Zavadil, Kevin R., and Nazar, Linda F. Nanostructured metal carbides for aprotic Li-O2 batteries. New insights into interfacial reactions and cathode stability. United States: N. p., 2015.
Web. doi:10.1021/acs.jpclett.5b00721.
Kundu, Dipan, Black, Robert, Adams, Brian, Harrison, Katharine, Zavadil, Kevin R., & Nazar, Linda F. Nanostructured metal carbides for aprotic Li-O2 batteries. New insights into interfacial reactions and cathode stability. United States. https://doi.org/10.1021/acs.jpclett.5b00721
Kundu, Dipan, Black, Robert, Adams, Brian, Harrison, Katharine, Zavadil, Kevin R., and Nazar, Linda F. Fri .
"Nanostructured metal carbides for aprotic Li-O2 batteries. New insights into interfacial reactions and cathode stability". United States. https://doi.org/10.1021/acs.jpclett.5b00721. https://www.osti.gov/servlets/purl/1235282.
@article{osti_1235282,
title = {Nanostructured metal carbides for aprotic Li-O2 batteries. New insights into interfacial reactions and cathode stability},
author = {Kundu, Dipan and Black, Robert and Adams, Brian and Harrison, Katharine and Zavadil, Kevin R. and Nazar, Linda F.},
abstractNote = {The development of nonaqueous Li–oxygen batteries, which relies on the reversible reaction of Li + O2 to give lithium peroxide (Li2O2), is challenged by several factors, not the least being the high charging voltage that results when carbon is typically employed as the cathode host. We report here on the remarkably low 3.2 V potential for Li2O2 oxidation on a passivated nanostructured metallic carbide (Mo2C), carbon-free cathode host. Furthermore, online mass spectrometry coupled with X-ray photoelectron spectroscopy unequivocally demonstrates that lithium peroxide is simultaneously oxidized together with the LixMoO3-passivated conductive interface formed on the carbide, owing to their close redox potentials. We found that the process rejuvenates the surface on each cycle upon electrochemical charge by releasing LixMoO3 into the electrolyte, explaining the low charging potential.},
doi = {10.1021/acs.jpclett.5b00721},
url = {https://www.osti.gov/biblio/1235282},
journal = {Journal of Physical Chemistry Letters},
issn = {1948-7185},
number = 12,
volume = 6,
place = {United States},
year = {2015},
month = {5}
}
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