Thermal stability analysis of lithium-ion battery electrolytes based on lithium bis(Trifluoromethanesulfonyl)imide-lithium difluoro(oxalato)borate dual-salt

Ya Ping Yang; An Chi Huang; Yan Tang; Ye Cheng Liu; Zhi Hao Wu; Hai Lin Zhou; Zhi Ping Li; Chi Min Shu; Jun Cheng Jiang; Zhi Xiang Xing

doi:10.3390/polym13050707

Thermal stability analysis of lithium-ion battery electrolytes based on lithium bis(Trifluoromethanesulfonyl)imide-lithium difluoro(oxalato)borate dual-salt

Ya Ping Yang, An Chi Huang, Yan Tang, Ye Cheng Liu, Zhi Hao Wu, Hai Lin Zhou, Zhi Ping Li, Chi Min Shu, Jun Cheng Jiang, Zhi Xiang Xing

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

Abstract

Lithium-ion batteries with conventional LiPF6 carbonate electrolytes are prone to failure at high temperature. In this work, the thermal stability of a dual-salt electrolyte of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB) in carbonate solvents was analyzed by accelerated rate calorimetry (ARC) and differential scanning calorimetry (DSC). LiTFSI-LiODFB dual-salt carbonate electrolyte decomposed when the temperature exceeded 138.5 °C in the DSC test and decomposed at 271.0 °C in the ARC test. The former is the onset decomposition temperature of the solvents in the electrolyte, and the latter is the LiTFSI-LiODFB dual salts. Flynn-Wall-Ozawa, Starink, and autocatalytic models were applied to determine pyrolysis kinetic parameters. The average apparent activation energy of the dual-salt electrolyte was 53.25 kJ/mol. According to the various model fitting, the thermal decomposition process of the dual-salt electrolyte followed the autocatalytic model. The results showed that the LiTFSI-LiODFB dual-salt electrolyte is significantly better than the LiPF6 electrolyte in terms of thermal stability.

Original language	English
Article number	707
Pages (from-to)	1-12
Number of pages	12
Journal	Polymers
Volume	13
Issue number	5
DOIs	https://doi.org/10.3390/polym13050707
State	Published - 1 Mar 2021
Externally published	Yes

Keywords

Accelerated rate calorimetry
Apparent activation energy
Autocatalytic models
Differential scanning calorimetry
LiTFSI-LiODFB dual-salt carbonate electrolyte
Thermal analysis

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3390/polym13050707

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@article{a8e456daf2714021a741eef52343c09c,

title = "Thermal stability analysis of lithium-ion battery electrolytes based on lithium bis(Trifluoromethanesulfonyl)imide-lithium difluoro(oxalato)borate dual-salt",

abstract = "Lithium-ion batteries with conventional LiPF6 carbonate electrolytes are prone to failure at high temperature. In this work, the thermal stability of a dual-salt electrolyte of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB) in carbonate solvents was analyzed by accelerated rate calorimetry (ARC) and differential scanning calorimetry (DSC). LiTFSI-LiODFB dual-salt carbonate electrolyte decomposed when the temperature exceeded 138.5 °C in the DSC test and decomposed at 271.0 °C in the ARC test. The former is the onset decomposition temperature of the solvents in the electrolyte, and the latter is the LiTFSI-LiODFB dual salts. Flynn-Wall-Ozawa, Starink, and autocatalytic models were applied to determine pyrolysis kinetic parameters. The average apparent activation energy of the dual-salt electrolyte was 53.25 kJ/mol. According to the various model fitting, the thermal decomposition process of the dual-salt electrolyte followed the autocatalytic model. The results showed that the LiTFSI-LiODFB dual-salt electrolyte is significantly better than the LiPF6 electrolyte in terms of thermal stability.",

keywords = "Accelerated rate calorimetry, Apparent activation energy, Autocatalytic models, Differential scanning calorimetry, LiTFSI-LiODFB dual-salt carbonate electrolyte, Thermal analysis",

author = "Yang, {Ya Ping} and Huang, {An Chi} and Yan Tang and Liu, {Ye Cheng} and Wu, {Zhi Hao} and Zhou, {Hai Lin} and Li, {Zhi Ping} and Shu, {Chi Min} and Jiang, {Jun Cheng} and Xing, {Zhi Xiang}",

note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = mar,

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doi = "10.3390/polym13050707",

language = "英语",

volume = "13",

pages = "1--12",

journal = "Polymers",

issn = "2073-4360",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "5",

}

TY - JOUR

T1 - Thermal stability analysis of lithium-ion battery electrolytes based on lithium bis(Trifluoromethanesulfonyl)imide-lithium difluoro(oxalato)borate dual-salt

AU - Yang, Ya Ping

AU - Huang, An Chi

AU - Tang, Yan

AU - Liu, Ye Cheng

AU - Wu, Zhi Hao

AU - Zhou, Hai Lin

AU - Li, Zhi Ping

AU - Shu, Chi Min

AU - Jiang, Jun Cheng

AU - Xing, Zhi Xiang

PY - 2021/3/1

Y1 - 2021/3/1

N2 - Lithium-ion batteries with conventional LiPF6 carbonate electrolytes are prone to failure at high temperature. In this work, the thermal stability of a dual-salt electrolyte of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB) in carbonate solvents was analyzed by accelerated rate calorimetry (ARC) and differential scanning calorimetry (DSC). LiTFSI-LiODFB dual-salt carbonate electrolyte decomposed when the temperature exceeded 138.5 °C in the DSC test and decomposed at 271.0 °C in the ARC test. The former is the onset decomposition temperature of the solvents in the electrolyte, and the latter is the LiTFSI-LiODFB dual salts. Flynn-Wall-Ozawa, Starink, and autocatalytic models were applied to determine pyrolysis kinetic parameters. The average apparent activation energy of the dual-salt electrolyte was 53.25 kJ/mol. According to the various model fitting, the thermal decomposition process of the dual-salt electrolyte followed the autocatalytic model. The results showed that the LiTFSI-LiODFB dual-salt electrolyte is significantly better than the LiPF6 electrolyte in terms of thermal stability.

AB - Lithium-ion batteries with conventional LiPF6 carbonate electrolytes are prone to failure at high temperature. In this work, the thermal stability of a dual-salt electrolyte of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB) in carbonate solvents was analyzed by accelerated rate calorimetry (ARC) and differential scanning calorimetry (DSC). LiTFSI-LiODFB dual-salt carbonate electrolyte decomposed when the temperature exceeded 138.5 °C in the DSC test and decomposed at 271.0 °C in the ARC test. The former is the onset decomposition temperature of the solvents in the electrolyte, and the latter is the LiTFSI-LiODFB dual salts. Flynn-Wall-Ozawa, Starink, and autocatalytic models were applied to determine pyrolysis kinetic parameters. The average apparent activation energy of the dual-salt electrolyte was 53.25 kJ/mol. According to the various model fitting, the thermal decomposition process of the dual-salt electrolyte followed the autocatalytic model. The results showed that the LiTFSI-LiODFB dual-salt electrolyte is significantly better than the LiPF6 electrolyte in terms of thermal stability.

KW - Accelerated rate calorimetry

KW - Apparent activation energy

KW - Autocatalytic models

KW - Differential scanning calorimetry

KW - LiTFSI-LiODFB dual-salt carbonate electrolyte

KW - Thermal analysis

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DO - 10.3390/polym13050707

M3 - 文章

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SN - 2073-4360

VL - 13

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JO - Polymers

JF - Polymers

IS - 5

M1 - 707

ER -

Thermal stability analysis of lithium-ion battery electrolytes based on lithium bis(Trifluoromethanesulfonyl)imide-lithium difluoro(oxalato)borate dual-salt

Abstract

Keywords

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