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The design of electrolyte suitable for low-temperature use is of great significance to expand the applications of energy storage devices. Dual-ion battery (DIB) with fast ion transport kinetics is expected to be a nascent battery system that can deliver high power density both at room temperature and low temperatures. In this work, we design a 4.8 M lithium bis(fluorosulfonyl)imide in 2,2,2-trifluoroethyl acetate/dimethyl carbonate (LiFSI FEA/DMC) + 1% LiPF6 electrolyte with a low melting point of about -93℃, enabling graphite cathode in a DIB to achieve excellent fast charge/discharge capability with a high capacity of about 108 mAh g-1 and 80 mAh g-1 at 10 C at 25℃ and 0℃, respectively. Even at -30℃, the graphite cathode can still give 69.2 mAh g-1 at 0.5 C. The graphite||Li DIB with 4.8 M LiFSI FEA/DMC + 1% LiPF6 electrolyte also exhibits a stable cycle life with a capacity retention of 91.5% at 5 C after 2000 cycles at 25 ℃. The electrolyte forms a uniform cathode electrolyte interface film on the graphite surface, as confirmed by transmission electron microscopy and X-ray photoelectron spectroscopy, which enables the outstanding electrochemical performance of the graphite cathode in a wide working temperature range from -30 ℃ to 25 ℃.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  © 2024.
  Licensed under the Creative Commons https://creativecommons.org/licenses/by-nc-nd/4.0/.

Keyword: electrolyte, Dual-ion battery, graphite cathode, electrode-electrolyte interphase, low temperature

Date published: 2024-05-30

Publisher: Elsevier BV

Journal:

• Chemical Engineering Journal (ISSN: 13858947) vol. 493 152602

Funding:

• University Grants Committee Research Grants Council

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4668

First published URL: https://doi.org/10.1016/j.cej.2024.152602

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Updated at: 2024-08-22 14:00:15 +0900

Published on MDR: 2026-05-31 08:25:50 +0900