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Dual-ion batteries (DIBs), well-known for the high-rate capability of the graphite cathode, urgently need a suitable anode material to realize their high power density in practical applications. In that respect, Li4Ti5O12 (LTO), which can be cycled at high rates for thousands of cycles, can be a good candidate. However, a facile method to stabilize the graphite||LTO full cells is necessary. Herein, we introduce LiDFOB additive into the electrolyte of graphite||LTO cells, which drastically improves the cycling performance and reduces self-discharge of the DIBs. Specifically, by adding 1.0 wt.% LiDFOB to 2M LiPF6 in fluorinated ethyl methyl carbonate, graphite||LTO DIBs can maintain stable charge-discharge for over 8000 cycles at 20 C. Characterizations indicate that LiDFOB forms a robust LiF-rich solid electrolyte interphase (SEI) on the LTO anode to suppress side reactions such as electrolyte decomposition and gas generation.

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

Keyword: Dual-ion batteries, LiDFOB additive, graphite, Li4Ti5O12, solid electrolyte interphase;, LiF

Date published: 2023-12-17

Publisher: Elsevier BV

Journal:

• Journal of Power Sources (ISSN: 03787753) vol. 592 233953

Funding:

• University Grants Committee Research Grants Council

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4694

First published URL: https://doi.org/10.1016/j.jpowsour.2023.233953

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Updated at: 2025-12-17 08:31:11 +0900

Published on MDR: 2025-12-17 08:07:06 +0900