Cited by 61Advancements in Battery MaterialsAdvanced Battery Technologies ResearchAdvanced Battery Materials and Technologies

1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4) as an ionic liquid-type electrolyte additive to enhance the low-temperature performance of LiNi0.5Co0.2Mn0.3O2/graphite batteries

Wang, Wenlian, Yang, Tianxiang, Li, Shuai, Fan, Weizhen, Zhao, Xiaoyang, Fan, Chaojun, Yu, Le, Zhou, Shaoyun +3 more·2019·Electrochimica Acta

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Crossref · 10.1016/j.electacta.2019.05.027

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  • EMI-BF4 additive showed higher reduction potential (0.95 V of EMI, 1.7 V of BF4) and lower oxidation potential (~3.5 V) compared to carbonate solvents, implying it can participate in SEI and CEI formation.

    “According to the electrochemical measurements, an electrolyte with the EMI-BF 4 additive showed higher reduction potential (0.95 V of EMI, 1.7 V of BF 4 ), and lower oxidation potential (~ 3.5 V) compared to carbonate solvents, implying that this additive can participate in the formation of the SEI and the CEI.”
  • EMI-BF4 additive-derived surface films prevented continuous reaction between electrolyte and electrodes, keeping structural integrity of NCM cathode and graphite anode.

    “The additive-derived surface films prevented the continuous reaction between the electrolyte and electrodes, keeping the structural integrity of NCM cathode and graphite anode.”
  • SEI and CEI surface films containing more LiF and less Li2CO3 resulted in higher ionic conductivity at both room and low temperatures.

    “Besides the protection nature, the SEI and CEI surface films containing more LiF and less Li 2 CO 3 resulted in higher ionic conductivity at both room and LTs based on EIS results.”
  • Graphite||NCM523 cell with EMI-BF4 additive delivered 45.8% of RT capacity at -30 °C, higher than baseline (16.3%).

    “by using EMI-BF 4 as an additive, a graphite||NCM523 cell can deliver 45.8% of RT capacity when discharged at -30 °C, much higher compared to the baseline electrolyte without additive (16.3%)”
  • Cell containing EMI-BF4 additive kept 89.4% capacity retention after 150 cycles at -10 °C, higher than 81% for baseline.

    “the cell containing EMI-BF 4 additive kept 89.4% capacity retention, higher than 81% for the baseline electrolyte after cycling at -10 °C after 150 cycles (Fig. 20b).”

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Authors
Wang, W., Yang, T., Li, S., Fan, W., Zhao, X., Fan, C., Yu, L., Zhou, S., Zuo, X., Zeng, R., & Nan, J.
Affiliations
South China Normal University (CN)
Corresponding author
  • Zuo, Xiaoxi
  • Nan, Junmin
Venue
Electrochimica Acta
Publisher
Elsevier BV
Published
2019-09
Volume
317
Pages
146-154
ISSN
0013-4686 (ISSN-L)
OpenAlex
W2944448153
Cited by
61
References
0
Citations by year
2026: 2 · 2025: 5 · 2024: 8 · 2023: 10 · 2022: 9 · 2021: 12 · 2020: 15
FWCI
3.24
Type
journal article
Language
en
Open access
closed
Locations
Electrochimica Acta (publishedVersion)
Funders
National Natural Science Foundation of China
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
1-ethyl-3-methylimidazolium tetrafluoroborate, NCM523 cathode, graphite anode, low-temperature performance, solid electrolyte interphase, capacity retention, Coulombic efficiency, lithium-ion batteries

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