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Nitrile-assistant eutectic electrolytes for cryogenic operation of lithium ion batteries at fast charges and discharges

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Cho, Yoon-Gyo, Kim, Young-Soo, Sung, Dong-Gil, Seo, Myung-Su, Song, Hyun-Kon·2014·Energy Environ. Sci.

Abstract

The charge/discharge characteristics of lithium ion batteries at low temperature (LT = −20 °C) are enhanced by using ethylene carbonate (EC)-based electrolytes with the help of assistant solvents of nitriles. Conventional liquid electrolytes (e.g. a mixture of EC and dimethyl carbonate (DMC), abbreviated as LED) cannot support a satisfactory capacity at low temperature as well as at high rates even if electric vehicles require low-temperature operation. Introducing propionitrile or butyronitrile (Pn or Bn) into LED (resulting in LEDPn or LEDBn) as a co-solvent increases significantly the high-rate capacities at −20 °C. For example, LEDPn delivers 62% of the available capacity at 1 C and 46% at 3 C with a 2.7 V cut-off while the control LED provides just 6% and 4% at the same rates. Successful operation at −20 °C with nitrile-assistant electrolytes results from high ionic conductivity, low viscosity and freezing point depression caused by the eutectic behavior of the carbonates (EC/DMC) and Pn. Based on the phase diagram of Pn with EC/DMC, we expect a meaningful battery operation up to −110 °C, probably lower, at the eutectic composition.

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Crossref · 10.1039/c3ee43029d

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  • Using the same salt LiPF6, an acetonitrile-based electrolyte has an ionic conductivity more than twice the value of an EC-DMC-based electrolyte at room temperature.

    “Using the same salt LiPF 6 , the AN-based electrolyte has an ionic conductivity more than twice the value of the EC-DMC-based electrolyte at RT [52].”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [52]

    Section 3.1 (page not indicated in our copy) reports room-temperature ionic conductivities of 20.5 mS cm⁻¹ for the acetonitrile-containing electrolyte and 11.33 mS cm⁻¹ for the EC–DMC control. Both used 1 M LiPF6, but 20.5 is about 1.81 times 11.33, not more than twice. (LLM, conf=0.90)

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  • Pouch cells using electrolytes with shorter alkyl chain nitrile (acetonitrile) with higher ionic conductivity delivered less discharge capacity at the same condition compared with propionitrile, which has the best retention at -20 °C for room-temperature capacity.

    “However, pouch cells using electrolytes with shorter alkyl chain nitrile (i.e., AN) with a higher ionic conductivity delivered less discharge capacity at the same condition compared with propionitrile (PN), which has the best retention at -20 °C for RT capacity.”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [52]

    Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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  • In all electrolyte systems studied by Cho, 2% fluoroethylene carbonate was used as a solid electrolyte interphase additive to relieve the graphite incompatibility issue of nitriles.

    “Moreover, in all electrolyte systems studied by Cho, 2% FEC was used as SEI additive to relieve the graphite incompatibility issue of nitriles.”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [52]

    Section 2.1 (page unavailable) states that 2 wt% FEC was used as an SEI-forming agent for the cell tests, supporting the amount and additive role. It does not say FEC was used in every electrolyte measurement or that its purpose was specifically to relieve nitrile–graphite incompatibility. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Electrolyte ionic conductivity was greatly improved after introducing nitriles.

    “The electrolyte ionic conductivity was greatly improved after introducing nitriles (Fig. 7a).”
  • Highly improved bulk ion transport properties effectively increased the discharge/charge capacity of graphite||NCA full cells at -20 °C.

    “The highly improved bulk ion transport properties effectively increased the discharge/charge capacity of graphite||NCA full cells at LT (-20 °C) (Fig. 7b).”

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Cites

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Research works printed but not linked: 23

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Authors
Cho, Y.-G., Kim, Y.-S., Sung, D.-G., Seo, M.-S., & Song, H.-K.
Affiliations
  • Ulsan National Institute of Science and Technology (KR)
  • Bexel (South Korea) (KR)
Corresponding author
Song, Hyun-Kon
Venue
Energy Environ. Sci.
Published
2014
Volume
7
Issue
5
Pages
1737-1743
ISSN
  • 1754-5692 (ISSN-L)
  • 1754-5706
OpenAlex
W2139463042
Cited by
85
References
24
Citations by year
2026: 11 · 2025: 14 · 2024: 10 · 2023: 11 · 2022: 10 · 2021: 8 · 2020: 7 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 1 · 2015: 2 · 2014: 1
FWCI
1.42
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Energy & Environmental Science (publishedVersion, cc-by-nc)
  • Scholarworks@UNIST (Ulsan National Institute of Science and Technology) (submittedVersion)
Funders
  • Ministry of Trade, Industry and Energy (10042948, 10Z20130011057)
  • Ministry of Science, ICT and Future Planning (10Z20130011057)
  • Ministry of Education, India
  • Korea Evaluation Institute of Industrial Technology (10Z20130011057)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Advancements in Battery Materials
  • Physical Sciences › Engineering › Automotive Engineering › Advanced Battery Technologies Research
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Battery Materials and Technologies
Keywords
lithium-ion batteries, cryogenic operation, low-temperature batteries, propionitrile, butyronitrile, ethylene carbonate, dimethyl carbonate, eutectic electrolytes, high-rate capacity, ionic conductivity, freezing point depression, phase diagram, electric vehicles

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