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Dissolution and ionization of sodium superoxide in sodium-oxygen batteries

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Title
Dissolution and ionization of sodium superoxide in sodium-oxygen batteries
Author(s)
Kim J.; Park H.; Byungju Lee; Seong W.M.; Lim H.-D.; Bae Y.; Haegyeom Kim; Kim W.K.; Ryu K.H.; Kisuk Kang
Publication Date
2016-02
Journal
NATURE COMMUNICATIONS, v.7, no., pp.10670 -
Publisher
NATURE PUBLISHING GROUP
Abstract
With the demand for high-energy-storage devices, the rechargeable metal-oxygen battery has attracted attention recently. Sodium-oxygen batteries have been regarded as the most promising candidates because of their lower-charge overpotential compared with that of lithium-oxygen system. However, conflicting observations with different discharge products have inhibited the understanding of precise reactions in the battery. Here we demonstrate that the competition between the electrochemical and chemical reactions in sodium-oxygen batteries leads to the dissolution and ionization of sodium superoxide, liberating superoxide anion and triggering the formation of sodium peroxide dihydrate (Na2O2 ·2H2O). On the formation of Na2O2 ·2H2O, the charge overpotential of sodium-oxygen cells significantly increases. This verification addresses the origin of conflicting discharge products and overpotentials observed in sodium-oxygen systems. Our proposed model provides guidelines to help direct the reactions in sodium-oxygen batteries to achieve high efficiency and rechargeability
URI
http://pr.ibs.re.kr/handle/8788114/2459
DOI
10.1038/ncomms10670
ISSN
2041-1723
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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