Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 43, Pages 14184-14187Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201809622
Keywords
alkali-metal anodes; batteries; liquid Na-K; liquid-liquid interfaces
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Funding
- Office of Vehicle Technologies of the U.S. Department of Energy through the Advanced Battery Materials Research (BMR) Program (Battery500 Consortium) [DE-EE0007762]
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The Na-K alloy is a liquid at 25 degrees C over a large compositional range. The liquid alloy is also immiscible in the organic-liquid electrolytes of an alkali-ion rechargeable battery, providing dendrite-free liquid alkali-metal batteries with a liquid-liquid anode-electrolyte interface at room temperature. The two liquids are each immobilized in a porous matrix. In previous work, the porous matrix used to immobilize the alloy was a carbon paper that is wet by the alloy at 420 degrees C; the alloy remains in the paper at room temperature. Here we report a room-temperature vacuum infiltration of the alloy into a porous Cu or Al membrane and a reversible stripping/plating of the liquid alloy with the immobilized organic-liquid electrolyte; no self-diacharge is observed since the liquid Na-K does not dissolve into the liquid carbonate electrolytes. The preparation and stripping/plating of the liquid alkali-metal anode can both now be done safely at room temperature.
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