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Kim, Youngsik
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Energy efficient Na-aqueous-catholyte redox flow battery

Author(s)
Senthilkumar, S.T.Han, JinhyupPark, JeongsunMin Hwang, SooJeon, DonghoonKim, Youngsik
Issued Date
2018-05
DOI
10.1016/j.ensm.2017.10.006
URI
https://scholarworks.unist.ac.kr/handle/201301/30431
Fulltext
https://www.sciencedirect.com/science/article/pii/S2405829717303884?via%3Dihub
Citation
ENERGY STORAGE MATERIALS, v.12, pp.324 - 330
Abstract
Redox flow battery (RFB) technologies have become play a significant role in the future for the storage of electrical energy produced from intermitted renewable energies such as solar, wind, and hydroelectric powers. Although the development of high-energy density RFB remains a challenging. Herein, we report the Na-aqueous-catholyte RFB (NaAqRFB) towards high-density electrical energy storage. Na-metal anode offers a high energy density and the use of an aqueous flowing catholyte decouples the energy and power. NASICON (Na3Zr2Si2PO12) is employed as a solid electrolyte in the NaAqRFB to separate the Na anode and a flowable aqueous catholyte. The constructed prototype NaAqRFB operates using a sodium-hexacyanoferrate solution as the aqueous catholyte with no added supporting salt/electrolyte, and yielded an average cell potential of ∼ 3.06 V (vs. Na/Na+), and an energy density of 54.16 Wh L−1 (based on the volume of catholyte) with high energy efficiency (∼ 92%, over 50 cycles), outperforming conventional RFB. The present work offers a new route for developing high-energy-density redox flow batteries.
Publisher
Elsevier B.V.
ISSN
2405-8297
Keyword (Author)
CapacityEnergy densityEnergy efficiencyFlow batterySodium hexacyanoferrate
Keyword
HYBRID ELECTROLYTEIONSTORAGESODIUMLIQUIDFERROCENECHEMISTRYVOLTAGECATHODELIFEPO4

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