Calcium-based multi-element chemistry for grid-scale electrochemical energy storage
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Author(s)
Ouchi, Takanari
Kim, Hojong
Spatocco, Brian Leonard
Sadoway, Donald Robert
Date Issued
March 2016
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Ouchi, Takanari, Hojong Kim, Brian L. Spatocco, and Donald R. Sadoway. “Calcium-Based Multi-Element Chemistry for Grid-Scale Electrochemical Energy Storage.” Nat Comms 7 (March 22, 2016): 10999.
Version
Final published version
Abstract
Calcium is an attractive material for the negative electrode in a rechargeable battery due to its
low electronegativity (high cell voltage), double valence, earth abundance and low cost;
however, the use of calcium has historically eluded researchers due to its high melting
temperature, high reactivity and unfavorably high solubility in molten salts. Here we
demonstrate a long-cycle-life calcium-metal-based rechargeable battery for grid-scale energy
storage. By deploying a multi-cation binary electrolyte in concert with an alloyed negative
electrode, calcium solubility in the electrolyte is suppressed and operating temperature is
reduced. These chemical mitigation strategies also engage another element in energy storage
reactions resulting in a multi-element battery. These initial results demonstrate how the
synergistic effects of deploying multiple chemical mitigation strategies coupled with the
relaxation of the requirement of a single itinerant ion can unlock calcium-based chemistries
and produce a battery with enhanced performance.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1038/ncomms10999
