Paving the Way for K-Ion Batteries: Role of Electrolyte Reactivity through the Example of Sb-Based Electrodes

Abstract : Developing potassium-ion batteries remains a challenge so far due to the lack of efficient electrolytes. Moreover, the high reactivity of K metal and the use of half-cells may greatly alter both the electrochemical performance and the solid electrolyte interphase formation. Here, it is shown that in K metal/Sb half-cells, Coulombic efficiency improvement is achieved by the addition of fluoroethylene carbonate + vinylene carbonate to propylene carbonate (PC), the replacement of PC by ethylene carbonate/diethyl carbonate, and the replacement of KPF6 by potassium bis(fluorosulfonyl)imide. Surprisingly, however, storage of cells containing K metal leads to the coloration of K metal, separators, and Sb electrodes, whereas no change occurs for cells prepared without K metal. These results demonstrate that for all electrolytes, the high electrolyte reactivity with K metal also influences the Sb/electrolyte interface via a cross-talk mechanism. This observation is supported by gas chromatography/mass spectrometry analysis of electrolytes and X-ray photoelectron spectroscopy analysis of Sb electrodes. In summary, these results indicate that the search for efficient electrolytes for potassium-ion batteries must be carried out in full cells if one wants to obtain meaningful correlations between electrochemical performance and electrode/electrolyte interfacial properties. Overall, the results presented here are also likely to benefit the development of other emerging Na- and Mg-ion cell chemistries.
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Journal articles
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https://hal.archives-ouvertes.fr/hal-01896379
Contributor : Lorenzo Stievano <>
Submitted on : Tuesday, October 16, 2018 - 10:02:23 AM
Last modification on : Tuesday, May 28, 2019 - 2:06:14 PM

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Lenaic Madec, Vincent Gabaudan, Grégory Gachot, Lorenzo Stievano, Laure Monconduit, et al.. Paving the Way for K-Ion Batteries: Role of Electrolyte Reactivity through the Example of Sb-Based Electrodes. ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2018, 10 (40), pp.34116 - 34122. ⟨10.1021/acsami.8b08902⟩. ⟨hal-01896379⟩

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