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Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V₂O₅ Batteries

Liu, Xu; Elia, Giuseppe Antonio; Gao, Xinpei; Qin, Bingsheng; Zhang, Huang; Passerini, Stefano

Abstract:
Highly concentrated glyme‐based electrolytes are friendly to a series of negative electrodes for potassium‐based batteries, including potassium metal. However, their compatibility with positive electrodes has been rarely explored. In this work, the influence of the molar fraction of potassium bis(trifluoromethanesulfonyl)imide dissolved in glyme on the cycling ability of K/bilayered‐V2O5 batteries has been investigated. At high salt concentration, the interaction between K+ ions with the glyme is strengthened, leading to a limited number of free glyme molecules. Therefore, the anodic decomposition of the electrolyte solvent, as well as the dissolution of the Al current collectors, is effectively suppressed, resulting in the improved cycling ability of the K/bilayered‐V2O5 cells. In these cells, the positive electrode active material exhibits reversible capacities of 93 and 57 mAh g−1 at specific current densities of 50 and 1000 mA g−1, respectively. After 200 charge‐discharge cycles at 500 mA g−1, the cell retains 94 % of the initial capacity. The promising rate performance and capacity retention demonstrate the importance of proper electrolyte engineering for the K/bilayered‐V2O5 batteries, and the good compatibility of highly concentrated glyme‐based electrolytes with positive electrode materials for potassium batteries.

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Verlagsausgabe §
DOI: 10.5445/IR/1000118015
Veröffentlicht am 03.04.2020
Originalveröffentlichung
DOI: 10.1002/batt.202000003
Web of Science
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2020
Sprache Englisch
Identifikator ISSN: 2566-6223, 2566-6223
KITopen-ID: 1000118015
Erschienen in Batteries & supercaps
Verlag Wiley
Band 3
Heft 3
Seiten 261–267
Vorab online veröffentlicht am 22.01.2020
Nachgewiesen in Web of Science
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