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Li‐Ion Battery Electrolyte Formulated for Low‐Temperature Applications

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Ein‐Eli, Y., Thomas, S. R., Chadha, R., Blakley, T. J., Koch, V. R.·1997·Journal of The Electrochemical Society

Abstract

Low‐temperature (<0°C) applications of Li‐ion batteries have prompted the search for improved, high‐conductivity electrolytes. Because the performance of the carbonaceous anode is highly sensitive to changes in electrolyte composition, we focused our efforts on this electrode. Electrolytes containing [lithium bis(trifluoromethanesulfonyl)imide], or LiIm, and [lithium tris(trifluoromethanesulfonyl)methide], or LiMe, in methyl formate (MF)‐ethylene carbonate (EC) solvent mixtures were tested in lithium‐graphite half‐cells. The graphite electrodes could be cycled at ambient temperature with high reversible capacity. The best supporting electrolyte was found to be , and the presence of a high concentration of ethylene carbonate and up to 300 ppm in the solution considerably increased the reversible capacity upon cycling. The conductivity values of a binary solvent mixture of methyl formate and ethylene carbonate containing or LiMe were measured between −40°C and room temperature. Graphite electrodes cycled at −2°C in these electrolytes obtained reasonable reversible capacity, approaching 50%.

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  • Methyl formate's reduction product is partially soluble in the electrolyte, failing to provide a stable solid electrolyte interphase, and low-temperature performance improvement was not realized.

    “Unfortunately, its reduction product is partially soluble in the electrolyte, hence failing to provide a stable SEI and the improvement of LT performance was not realized [37,38].”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [37]

    The Results and Discussion (page unavailable) state that Li-formate, methyl formate’s reduction product, is partially soluble and does not fully passivate graphite. But the paper does not conclude that low-temperature performance improvement was not realized: it reports reasonable reversible capacity at −2°C in the tested methyl formate–ethylene carbonate electrolytes, although capacity fell relative to room temperature. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Methyl formate has the advantages of low viscosity, low melting point (-99 °C), and relatively high oxidation stability.

    “Their results suggested that MF has the advantages of low viscosity, low melting point (-99 °C) and relatively high oxidation stability.”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [37]

    The Introduction (page not available in our copy) states that methyl formate melts at −99 °C and is highly stable upon oxidation. It describes methyl-formate salt solutions as highly conductive, but does not state that methyl formate has low viscosity; a search for “viscosity” found no supporting passage. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Authors
Ein‐Eli, Y., Thomas, S. R., Chadha, R., Blakley, T. J., & Koch, V. R.
Affiliations
Covalent Associates (United States) (US)
Venue
Journal of The Electrochemical Society
Published
1997-03-01
Volume
144
Issue
3
Pages
823-829
ISSN
  • 0013-4651 (ISSN-L)
  • 1945-7111
OpenAlex
W2055717997
Cited by
116
References
0
Citations by year
2026: 3 · 2025: 10 · 2024: 6 · 2023: 11 · 2022: 6 · 2021: 8 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 5 · 2016: 1 · 2015: 4 · 2014: 3 · 2013: 1 · 2012: 1
FWCI
6.52
Type
journal article
Language
en
Open access
Locations
Journal of The Electrochemical Society (publishedVersion)
Funders
Office of Naval Research
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Advancements in Battery Materials
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Battery Materials and Technologies
  • Physical Sciences › Engineering › Automotive Engineering › Advanced Battery Technologies Research
Keywords
lithium-ion battery electrolytes, low-temperature cycling, LiTFSI, methyl formate, ethylene carbonate, mixed solvents, ionic conductivity, graphite anode, reversible capacity, supporting electrolyte

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