Formation of robust CEI film on high voltage LiNi0.6Co0.2Mn0.2O2 cathode enabled by functional [PIVM][TFSA] ionic liquid additive

Yingjun Cai; Tinghua Xu; Xianglei Meng; Nicolas von Solms; Haitao Zhang; Kaj Thomsen

doi:10.1016/j.electacta.2022.140679

Formation of robust CEI film on high voltage LiNi0.6Co0.2Mn0.2O2 cathode enabled by functional [PIVM][TFSA] ionic liquid additive

Yingjun Cai, Tinghua Xu, Xianglei Meng, Nicolas von Solms, Haitao Zhang, Kaj Thomsen^*

^*Corresponding author for this work

Chinese Academy of Sciences

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

The ionic liquid 1-(3-amino-3-oxopropyl)-3-vinylimidazolium bis(trifluoromethylsulfonyl)amide ([PIVM][TFSA]) was synthesized and applied in the electrolyte of Li/LiNi_0.6Co_0.2Mn_0.2O₂ lithium ion batteries. The thermostability of this pure ionic liquid was investigated to provide a wide liquid range from -50 ℃ to 200 ℃. The physicochemical properties of binary mixtures of this ionic liquid with DMC and EMC were measured at different temperatures and with different ionic liquid mole fractions. [PIVM][TFSA] widens the electrochemical window of the electrolyte. The ionic liquid inhibits the increasing of water and HF content in the electrolyte. A comparison of charge and discharge performances in different electrolytes with various content of ionic liquid is reported. The electrolyte with the concentration of 1.0 wt % [PIVM][TFSA] has the best electrochemical properties. It enhances the initial capacity, the capacity retention and the high current rate performance of the cells. The surface film on the electrodes was confirmed by SEM and XPS that the ionic liquid [PIVM][TFSA] participated in membrane formation and played an active role.

Original language	English
Article number	140679
Journal	Electrochimica Acta
Volume	424
Number of pages	8
ISSN	0013-4686
DOIs	https://doi.org/10.1016/j.electacta.2022.140679
Publication status	Published - 2022

Keywords

Lithium ion batteries
Electrolyte
ionic liquid
High-voltage
Additive

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@article{b365ef18610146f1bfcdff56781ee2a8,

title = "Formation of robust CEI film on high voltage LiNi0.6Co0.2Mn0.2O2 cathode enabled by functional [PIVM][TFSA] ionic liquid additive",

abstract = "The ionic liquid 1-(3-amino-3-oxopropyl)-3-vinylimidazolium bis(trifluoromethylsulfonyl)amide ([PIVM][TFSA]) was synthesized and applied in the electrolyte of Li/LiNi0.6Co0.2Mn0.2O2 lithium ion batteries. The thermostability of this pure ionic liquid was investigated to provide a wide liquid range from -50 ℃ to 200 ℃. The physicochemical properties of binary mixtures of this ionic liquid with DMC and EMC were measured at different temperatures and with different ionic liquid mole fractions. [PIVM][TFSA] widens the electrochemical window of the electrolyte. The ionic liquid inhibits the increasing of water and HF content in the electrolyte. A comparison of charge and discharge performances in different electrolytes with various content of ionic liquid is reported. The electrolyte with the concentration of 1.0 wt % [PIVM][TFSA] has the best electrochemical properties. It enhances the initial capacity, the capacity retention and the high current rate performance of the cells. The surface film on the electrodes was confirmed by SEM and XPS that the ionic liquid [PIVM][TFSA] participated in membrane formation and played an active role.",

keywords = "Lithium ion batteries, Electrolyte, ionic liquid, High-voltage, Additive",

author = "Yingjun Cai and Tinghua Xu and Xianglei Meng and {von Solms}, Nicolas and Haitao Zhang and Kaj Thomsen",

year = "2022",

doi = "10.1016/j.electacta.2022.140679",

language = "English",

volume = "424",

journal = "Electrochimica Acta",

issn = "0013-4686",

publisher = "Pergamon Press",

}

TY - JOUR

T1 - Formation of robust CEI film on high voltage LiNi0.6Co0.2Mn0.2O2 cathode enabled by functional [PIVM][TFSA] ionic liquid additive

AU - Cai, Yingjun

AU - Xu, Tinghua

AU - Meng, Xianglei

AU - von Solms, Nicolas

AU - Zhang, Haitao

AU - Thomsen, Kaj

PY - 2022

Y1 - 2022

N2 - The ionic liquid 1-(3-amino-3-oxopropyl)-3-vinylimidazolium bis(trifluoromethylsulfonyl)amide ([PIVM][TFSA]) was synthesized and applied in the electrolyte of Li/LiNi0.6Co0.2Mn0.2O2 lithium ion batteries. The thermostability of this pure ionic liquid was investigated to provide a wide liquid range from -50 ℃ to 200 ℃. The physicochemical properties of binary mixtures of this ionic liquid with DMC and EMC were measured at different temperatures and with different ionic liquid mole fractions. [PIVM][TFSA] widens the electrochemical window of the electrolyte. The ionic liquid inhibits the increasing of water and HF content in the electrolyte. A comparison of charge and discharge performances in different electrolytes with various content of ionic liquid is reported. The electrolyte with the concentration of 1.0 wt % [PIVM][TFSA] has the best electrochemical properties. It enhances the initial capacity, the capacity retention and the high current rate performance of the cells. The surface film on the electrodes was confirmed by SEM and XPS that the ionic liquid [PIVM][TFSA] participated in membrane formation and played an active role.

AB - The ionic liquid 1-(3-amino-3-oxopropyl)-3-vinylimidazolium bis(trifluoromethylsulfonyl)amide ([PIVM][TFSA]) was synthesized and applied in the electrolyte of Li/LiNi0.6Co0.2Mn0.2O2 lithium ion batteries. The thermostability of this pure ionic liquid was investigated to provide a wide liquid range from -50 ℃ to 200 ℃. The physicochemical properties of binary mixtures of this ionic liquid with DMC and EMC were measured at different temperatures and with different ionic liquid mole fractions. [PIVM][TFSA] widens the electrochemical window of the electrolyte. The ionic liquid inhibits the increasing of water and HF content in the electrolyte. A comparison of charge and discharge performances in different electrolytes with various content of ionic liquid is reported. The electrolyte with the concentration of 1.0 wt % [PIVM][TFSA] has the best electrochemical properties. It enhances the initial capacity, the capacity retention and the high current rate performance of the cells. The surface film on the electrodes was confirmed by SEM and XPS that the ionic liquid [PIVM][TFSA] participated in membrane formation and played an active role.

KW - Lithium ion batteries

KW - Electrolyte

KW - ionic liquid

KW - High-voltage

KW - Additive

U2 - 10.1016/j.electacta.2022.140679

DO - 10.1016/j.electacta.2022.140679

M3 - Journal article

SN - 0013-4686

VL - 424

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 140679

ER -

Formation of robust CEI film on high voltage LiNi0.6Co0.2Mn0.2O2 cathode enabled by functional [PIVM][TFSA] ionic liquid additive

Abstract

Keywords

UN SDGs

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