Solid electrolyte interphases for high-energy aqueous aluminum electrochemical cells
- Cornell University, Ithaca, New York (United States). Robert Frederick Smith School of Chemical and Biomolecular Engineering; DOE/OSTI
- Cornell University, Ithaca, New York (United States). School of Applied and Engineering Physics
- Research & Development Center, Saudi Aramco, Dhahran (Saudi Arabia).
- Cornell University, Ithaca, New York (United States). Department of Materials Science and Engineering
- Cornell University, Ithaca, New York (United States). School of Applied and Engineering Physics; Cornell University, Ithaca, New York (United States). Kavli Institute at Cornell for Nanoscale Science
- Cornell University, Ithaca, New York (United States). Robert Frederick Smith School of Chemical and Biomolecular Engineering; Cornell University, Ithaca, New York (United States). Department of Materials Science and Engineering
Electrochemical cells based on aluminum (Al) are of long-standing interest because Al is earth abundant, low cost, and chemically inert. The trivalent Al3+ions also offer among the highest volume-specific charge storage capacities (8040 mAh cm-3), approximately four times larger than achievable for Li metal anodes. Rapid and irreversible formation of a high-electrical bandgap passivating Al2O3oxide film on Al have, to date, frustrated all efforts to create aqueous Al-based electrochemical cells with high reversibility. Here, we investigate the interphases formed on metallic Al in contact with ionic liquid (IL)–eutectic electrolytes and find that artificial solid electrolyte interphases (ASEIs) formed spontaneously on the metal permanently transform its interfacial chemistry. The resultant IL-ASEIs are further shown to enable aqueous Al electrochemical cells with unprecedented reversibility. As an illustration of the potential benefits of these interphases, we create simple Al||MnO2aqueous cells and report that they provide high specific energy (approximately 500 Wh/kg, based on MnO2mass in the cathode) and intrinsic safety features required for applications.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- Grant/Contract Number:
- AR0000750; SC0016082
- OSTI ID:
- 1626004
- Journal Information:
- Science Advances, Journal Name: Science Advances Journal Issue: 11 Vol. 4; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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