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Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt

Lithium-ion batteries with conventional LiPF(6) 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 wa...

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Autores principales: Yang, Ya-Ping, Huang, An-Chi, Tang, Yan, Liu, Ye-Cheng, Wu, Zhi-Hao, Zhou, Hai-Lin, Li, Zhi-Ping, Shu, Chi-Min, Jiang, Jun-Cheng, Xing, Zhi-Xiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956355/
https://www.ncbi.nlm.nih.gov/pubmed/33652664
http://dx.doi.org/10.3390/polym13050707
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author Yang, Ya-Ping
Huang, An-Chi
Tang, Yan
Liu, Ye-Cheng
Wu, Zhi-Hao
Zhou, Hai-Lin
Li, Zhi-Ping
Shu, Chi-Min
Jiang, Jun-Cheng
Xing, Zhi-Xiang
author_facet Yang, Ya-Ping
Huang, An-Chi
Tang, Yan
Liu, Ye-Cheng
Wu, Zhi-Hao
Zhou, Hai-Lin
Li, Zhi-Ping
Shu, Chi-Min
Jiang, Jun-Cheng
Xing, Zhi-Xiang
author_sort Yang, Ya-Ping
collection PubMed
description Lithium-ion batteries with conventional LiPF(6) 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 LiPF(6) electrolyte in terms of thermal stability.
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spelling pubmed-79563552021-03-16 Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt Yang, Ya-Ping Huang, An-Chi Tang, Yan Liu, Ye-Cheng Wu, Zhi-Hao Zhou, Hai-Lin Li, Zhi-Ping Shu, Chi-Min Jiang, Jun-Cheng Xing, Zhi-Xiang Polymers (Basel) Article Lithium-ion batteries with conventional LiPF(6) 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 LiPF(6) electrolyte in terms of thermal stability. MDPI 2021-02-26 /pmc/articles/PMC7956355/ /pubmed/33652664 http://dx.doi.org/10.3390/polym13050707 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yang, Ya-Ping
Huang, An-Chi
Tang, Yan
Liu, Ye-Cheng
Wu, Zhi-Hao
Zhou, Hai-Lin
Li, Zhi-Ping
Shu, Chi-Min
Jiang, Jun-Cheng
Xing, Zhi-Xiang
Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt
title Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt
title_full Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt
title_fullStr Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt
title_full_unstemmed Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt
title_short Thermal Stability Analysis of Lithium-Ion Battery Electrolytes Based on Lithium Bis(trifluoromethanesulfonyl)imide-Lithium Difluoro(oxalato)Borate Dual-Salt
title_sort thermal stability analysis of lithium-ion battery electrolytes based on lithium bis(trifluoromethanesulfonyl)imide-lithium difluoro(oxalato)borate dual-salt
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956355/
https://www.ncbi.nlm.nih.gov/pubmed/33652664
http://dx.doi.org/10.3390/polym13050707
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