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Kim, Youngsik
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Enhancing Capacity Performance by Utilizing the Redox Chemistry of the Electrolyte in a Dual-Electrolyte Sodium-Ion Battery

Author(s)
Senthilkumar, Sirugaloor ThangavelBae, HyuntaeHan, JinhyupKim, Youngsik
Issued Date
2018-05
DOI
10.1002/anie.201800181
URI
https://scholarworks.unist.ac.kr/handle/201301/24147
Fulltext
https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201800181
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.57, no.19, pp.5335 - 5339
Abstract
A strategy is described to increase charge storage in a dual electrolyte Na-ion battery (DESIB) by combining the redox chemistry of the electrolyte with a Na+ ion de-insertion/insertion cathode. Conventional electrolytes do not contribute to charge storage in battery systems, but redox-active electrolytes augment this property via charge transfer reactions at the electrode-electrolyte interface. The capacity of the cathode combined with that provided by the electrolyte redox reaction thus increases overall charge storage. An aqueous sodium hexacyanoferrate (Na4Fe(CN)(6)) solution is employed as the redox-active electrolyte (Na-FC) and sodium nickel Prussian blue (Na-x-NiBP) as the Na+ ion insertion/de-insertion cathode. The capacity of DESIB with Na-FC electrolyte is twice that of a battery using a conventional (Na2SO4) electrolyte. The use of redox-active electrolytes in batteries of any kind is an efficient and scalable approach to develop advanced high-energy-density storage systems.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1433-7851
Keyword (Author)
capacity enhancementdual electrolyte batteriesredox chemistryredox-active electrolytessodium
Keyword
AQUEOUS SODIUMINTERCALATION CHEMISTRYAIR BATTERIESCATHODEFERRICYANIDEEFFICIENCY

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