Cited by 26Advancements in Battery MaterialsAdvanced Battery Materials and TechnologiesAdvanced Battery Technologies Research

Interface stabilization via lithium bis(fluorosulfonyl)imide additive as a key for promoted performance of graphite‖LiCoO2 pouch cell under −20 ○C

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Pham, Hieu Quang, Chung, Gyeong Jun, Han, Jisoo, Hwang, Eui-Hyung, Kwon, Young-Gil, Song, Seung-Wan·2020·The Journal of Chemical Physics

Abstract

The effects of lithium bis(fluorosulfonyl)imide, Li[N(SO2F)2] (LiFSI), as an additive on the low-temperature performance of graphite‖LiCoO2 pouch cells are investigated. The cell, which includes 0.2M LiFSI salt additive in the 1M lithium hexafluorophosphate (LiPF6)-based conventional electrolyte, outperforms the one without additive under −20 °C and high charge cutoff voltage of 4.3 V, delivering higher discharge capacity and promoted rate performance and cycling stability with the reduced change in interfacial resistance. Surface analysis results on the cycled LiCoO2 cathodes and cycled graphite anodes extracted from the cells provide evidence that a LiFSI-induced improvement of high-voltage cycling stability at low temperature originates from the formation of a less resistive solid electrolyte interphase layer, which contains plenty of LiFSI-derived organic compounds mixed with inorganics that passivate and protect the surface of the cathode and anode from further electrolyte decomposition and promotes Li+ ion-transport kinetics despite the low temperature, inhibiting Li metal-plating at the anode. The results demonstrate the beneficial effects of the LiFSI additive on the performance of a lithium-ion battery for use in battery-powered electric vehicles and energy storage systems in cold climates and regions.

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  • When cycled between 3.0 and 4.3 V at -20 °C, the cell using LiFSI additive delivered ~30% higher capacity than baseline at all rates of 0.1 C, 0.2 C, 0.5 C, 1 C, and 2 C.

    “when cycled between 3.0 and 4.3 V at -20 °C, the cell using LiFSI additive delivered ~ 30% higher capacity than the baseline electrolyte at all rates of 0.1 C, 0.2 C, 0.5 C, 1 C, and 2 C.”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [139]

    The Fig. 4 rate-capability discussion reports higher discharge capacities with LiFSI at every listed rate between 0.1 C and 2 C, under −20 °C and between 3.0 and 4.3 V. Its reported values imply increases of about 34% at 0.1 C and 39–46% at the other listed rates, so the claim’s “~30% higher” magnitude does not fit all rates. The supplied passage does not specify a page. (LLM, conf=0.89)

    Experimental — accuracy not yet measured
  • Addition of the ionic additive LiFSI can suppress Li plating compared to a baseline cell.

    “It was reported that the addition of ionic additive LiFSI can suppress the Li plating compared to the baseline cell.”
  • For a graphite||LiCoO2 cell with 0.2 M LiFSI additive, SEI impedance was significantly decreased and Li plating was suppressed compared with baseline electrolyte.

    “For the graphite||LiCoO 2 cell using 1 M LiPF 6 /EC:EMC baseline electrolytes with 0.2 M LiFSI additive, the SEI impedance was significantly decreased and Li plating was suppressed compared with the baseline electrolyte.”
  • At -40 °C, the Li-LFP cell showed 90% capacity retention after 100 cycles at a cathode-limited areal capacity of 5 mAh cm-2.

    “At -40 °C, the Li-LFP cell showed 90% capacity retention after 100 cycles at the cathode-limited areal capacity (5 mAh cm -2 ).”

    From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [139]

    The Experimental Section (page unavailable) describes graphite‖LiCoO₂ pouch cells cycled at −20 °C for 50 cycles, not Li–LFP cells. A search for Li–LFP, −40 °C, 100 cycles, and 5 mAh cm⁻² found no passage reporting the claimed result; the different experiment does not establish that the claimed result is false. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

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Cited by

Sorted by citations

Authors
Pham, H. Q., Chung, G. J., Han, J., Hwang, E.-H., Kwon, Y.-G., & Song, S.-W.
Affiliations
  • Chungnam National University (KR)
  • Lichem Co., Ltd. 2 , Geumsan 32715, South Korea
Corresponding author
Song, Seung-Wan
Venue
The Journal of Chemical Physics
Published
2020-03-04
Volume
152
Issue
9
Pages
094709-094709
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
OpenAlex
W3010122703
Cited by
26
References
0
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 5 · 2022: 7 · 2021: 5
FWCI
1.46
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • The Journal of Chemical Physics (publishedVersion)
  • PubMed (publishedVersion)
  • DORA PSI (Paul Scherrer Institute) (submittedVersion, other-oa)
Funders
  • National Research Foundation of Korea (2019R1A2C1084024)
  • Ministry of Trade, Industry and Energy (A0022-00725, R0004645)
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
LiFSI, electrolyte additives, graphite anode, LiCoO2 cathode, pouch cells, low-temperature performance, solid electrolyte interphase, interfacial resistance, high-voltage cycling stability, lithium metal plating, rate capability

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