Synergistic effect of quinary molten salts and ruthenium catalyst for high-power-density lithium-carbon dioxide cell

Kyungeun Baek, Woo Cheol Jeon, Seongho Woo, Jin Chul Kim, Jun Gyeong Lee, Kwangjin An (), Sang Kyu Kwak () and Seok Ju Kang ()
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Kyungeun Baek: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Woo Cheol Jeon: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Seongho Woo: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jin Chul Kim: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jun Gyeong Lee: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Kwangjin An: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Sang Kyu Kwak: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Seok Ju Kang: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract With a recent increase in interest in metal-gas batteries, the lithium-carbon dioxide cell has attracted considerable attention because of its extraordinary carbon dioxide-capture ability during the discharge process and its potential application as a power source for Mars exploration. However, owing to the stable lithium carbonate discharge product, the cell enables operation only at low current densities, which significantly limits the application of lithium-carbon dioxide batteries and effective carbon dioxide-capture cells. Here, we investigate a high-performance lithium-carbon dioxide cell using a quinary molten salt electrolyte and ruthenium nanoparticles on the carbon cathode. The nitrate-based molten salt electrolyte allows us to observe the enhanced carbon dioxide-capture rate and the reduced discharge-charge over-potential gap with that of conventional lithium-carbon dioxide cells. Furthermore, owing to the ruthernium catalyst, the cell sustains its performance over more than 300 cycles at a current density of 10.0 A g−1 and exhibits a peak power density of 33.4 mW cm−2.

Date: 2020
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DOI: 10.1038/s41467-019-14121-1

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