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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Chemical Stability and Degradation Mechanism of Solid Electrolytes/Aqueous Media at a Steady State for Long-Lasting Sodium Batteries

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dc.contributor.author Wi, Tae-Ung ko
dc.contributor.author Lee, Chanhee ko
dc.contributor.author Rahman, M. Fahmi ko
dc.contributor.author Go, Wooseok ko
dc.contributor.author Kim, Su Hwan ko
dc.contributor.author Hwang, Dae Yeon ko
dc.contributor.author Kwak, Sang Kyu ko
dc.contributor.author Kim, Youngsik ko
dc.contributor.author Lee, Hyun-Wook ko
dc.date.available 2021-02-04T07:50:46Z -
dc.date.created 2021-01-08 ko
dc.date.issued 2021-01 ko
dc.identifier.citation CHEMISTRY OF MATERIALS, v.33, no.1, pp.126 - 135 ko
dc.identifier.issn 0897-4756 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/49935 -
dc.description.abstract Research on the interface between solid electrolytes and electrode materials or catholyte is important to effectively and safely use their high energy densities. However, compared to interfaces with electrode materials, the interface between solid electrolytes and liquid media lacks research. Herein, the stability of NA superionic conductor (NASICON) pellets is studied in various aqueous solutions, including deionized (DI) water and a marine environment, associated with different degradation mechanisms. A representative detrimental hydronium exchange reaction between solid electrolytes and aqueous media is suppressed with increasing concentration and ion types dissolved in the solutions. Results of density functional theory calculation and electron energy loss spectroscopy reveal the different activation energies and chemical bonding states of solid electrolytes based on the aqueous solutions' conditions. NASICON's ionic conductivity decreases to similar to 10(-6) S/cm because of severe changes in aqueous solutions with insufficient dissolved ions resulting in inferior chemical stability. Furthermore, chemical stability variations at a steady state can severely affect battery performance. Seawater batteries fabricated with NASICON in immersed DI water for 1 year exhibit a large resistance region from the first cycle; this system breaks down before 200 h, unlike a cell fabricated using NASICON immersed for 1 year in a marine environment. ko
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Chemical Stability and Degradation Mechanism of Solid Electrolytes/Aqueous Media at a Steady State for Long-Lasting Sodium Batteries ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85099092983 ko
dc.identifier.wosid 000610984700011 ko
dc.type.rims ART ko
dc.identifier.doi 10.1021/acs.chemmater.0c03022 ko
dc.identifier.url https://pubs.acs.org/doi/10.1021/acs.chemmater.0c03022 ko
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