Competition between Conversion Reaction with Cerium Dioxide and Lithium Plating in Superconcentrated Electrolyte

  • Tohru Shiga*
    Tohru Shiga
    Toyota Central Research & Development Laboratories Inc., Yokomichi, Nagakute, Aichi-ken 480-1192, Japan
    *Email: [email protected]
    More by Tohru Shiga
  • Yumi Masuoka
    Yumi Masuoka
    Toyota Central Research & Development Laboratories Inc., Yokomichi, Nagakute, Aichi-ken 480-1192, Japan
    More by Yumi Masuoka
  • , and 
  • Yuichi Kato
    Yuichi Kato
    Toyota Central Research & Development Laboratories Inc., Yokomichi, Nagakute, Aichi-ken 480-1192, Japan
    More by Yuichi Kato
Cite this: Langmuir 2020, 36, 46, 14039–14045
Publication Date (Web):November 11, 2020
https://doi.org/10.1021/acs.langmuir.0c02622
Copyright © 2020 American Chemical Society
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Abstract

Li-ion insertion into cerium dioxide (CeO2) and its subsequent conversion reaction were studied using a CeO2/copper composite electrode in a superconcentrated electrolyte of lithium bis(fluorosulfonyl)amide (LiFSA) and methylphenylamino-di(trifluoroethyl) phosphate (PNMePh) under conditions promoting Li plating/stripping. Since the conversion reaction potential with CeO2 generally lies above the Li plating/stripping level, the conversion ideally occurs first in the cathodic scan. However, the conversion reaction was delayed until after the Li plating in the superconcentrated electrolyte contrary to expectations, whereas this phenomenon was unobserved in a dilute LiFSA/PNMePh electrolyte. Energy-dispersive X-ray spectroscopy and electrochemical impedance analysis indicated that the reversed order of the electrochemical behaviors was caused by the solid electrolyte interphase (SEI) on the CeO2, which had a different material composition and a higher interfacial resistance than the SEI on electrodeposited metallic lithium.

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  • Materials; FE-SEM images of Cu + CeO2 electrode; Cu + CeO2/Li cell performance; CV curves for diluted and superconcentrated electrolytes; and EIS analysis data (PDF)

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This article is cited by 1 publications.

  1. Tohru Shiga, Yumi Masuoka, Hiroshi Nozaki. Observation of lithium stripping in super-concentrated electrolyte at potentials lower than regular Li stripping. RSC Advances 2021, 11 (22) , 13359-13365. https://doi.org/10.1039/D1RA01490K