Thermal risk evaluation of concentrated electrolytes for Li-ion batteries

Concentrated electrolytes have been attracting increasing attention due to their unique properties. However, despite the concern about their thermal stability, few research has been done on their exothermic behaviors, especially with the coexistence of electrodes. Herein, we report the results of de...

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Autores principales:	Liwei Zhao, Atsushi Inoishi, Shigeto Okada
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Concentrated electrolyte Salt concentration Thermal stability Thermal runaway Li-ion battery Industrial electrochemistry TP250-261 Electric apparatus and materials. Electric circuits. Electric networks TK452-454.4
Acceso en línea:	https://doaj.org/article/147ac3cb2ced401d8d12226b8452425e
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spelling	oai:doaj.org-article:147ac3cb2ced401d8d12226b8452425e2021-11-26T04:40:50ZThermal risk evaluation of concentrated electrolytes for Li-ion batteries2666-248510.1016/j.powera.2021.100079https://doaj.org/article/147ac3cb2ced401d8d12226b8452425e2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666248521000342https://doaj.org/toc/2666-2485Concentrated electrolytes have been attracting increasing attention due to their unique properties. However, despite the concern about their thermal stability, few research has been done on their exothermic behaviors, especially with the coexistence of electrodes. Herein, we report the results of detailed investigation into the thermal properties of LiBF4, LiPF6, LiTFSI, and LiFSI/carbonate concentrated solutions and their thermal behaviors with the coexistence of fully lithiated graphite. Concentrated LiBF4 solutions showed no practical application possibilities because they were unstable on C6Li. Increasing the salt concentration decreased the thermal stability of LiPF6/PC solutions with the coexistence of C6Li. The organic salt dominated the thermal behavior of the solution when mixed with C6Li. A drastic exothermic reaction happened at 210–220 °C when C6Li was mixed with LiFSI solutions, indicating a very high thermal risk of LiFSI carbonate solutions as LIB electrolytes. In contrast, LiTFSI solutions showed much milder reactions with C6Li. On the other hand, because of the different LiF content in SEI, the exothermic onset temperature of the C6Li mixture with the concentrated solution increased in the order of LiFSI > LiTFSI > LiPF6. Comprehensively, concentrated LiTFSI electrolytes should be a good choice for LIB from the standpoint of battery safety.Liwei ZhaoAtsushi InoishiShigeto OkadaElsevierarticleConcentrated electrolyteSalt concentrationThermal stabilityThermal runawayLi-ion batteryIndustrial electrochemistryTP250-261Electric apparatus and materials. Electric circuits. Electric networksTK452-454.4ENJournal of Power Sources Advances, Vol 12, Iss , Pp 100079- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Concentrated electrolyte Salt concentration Thermal stability Thermal runaway Li-ion battery Industrial electrochemistry TP250-261 Electric apparatus and materials. Electric circuits. Electric networks TK452-454.4
spellingShingle	Concentrated electrolyte Salt concentration Thermal stability Thermal runaway Li-ion battery Industrial electrochemistry TP250-261 Electric apparatus and materials. Electric circuits. Electric networks TK452-454.4 Liwei Zhao Atsushi Inoishi Shigeto Okada Thermal risk evaluation of concentrated electrolytes for Li-ion batteries
description	Concentrated electrolytes have been attracting increasing attention due to their unique properties. However, despite the concern about their thermal stability, few research has been done on their exothermic behaviors, especially with the coexistence of electrodes. Herein, we report the results of detailed investigation into the thermal properties of LiBF4, LiPF6, LiTFSI, and LiFSI/carbonate concentrated solutions and their thermal behaviors with the coexistence of fully lithiated graphite. Concentrated LiBF4 solutions showed no practical application possibilities because they were unstable on C6Li. Increasing the salt concentration decreased the thermal stability of LiPF6/PC solutions with the coexistence of C6Li. The organic salt dominated the thermal behavior of the solution when mixed with C6Li. A drastic exothermic reaction happened at 210–220 °C when C6Li was mixed with LiFSI solutions, indicating a very high thermal risk of LiFSI carbonate solutions as LIB electrolytes. In contrast, LiTFSI solutions showed much milder reactions with C6Li. On the other hand, because of the different LiF content in SEI, the exothermic onset temperature of the C6Li mixture with the concentrated solution increased in the order of LiFSI > LiTFSI > LiPF6. Comprehensively, concentrated LiTFSI electrolytes should be a good choice for LIB from the standpoint of battery safety.
format	article
author	Liwei Zhao Atsushi Inoishi Shigeto Okada
author_facet	Liwei Zhao Atsushi Inoishi Shigeto Okada
author_sort	Liwei Zhao
title	Thermal risk evaluation of concentrated electrolytes for Li-ion batteries
title_short	Thermal risk evaluation of concentrated electrolytes for Li-ion batteries
title_full	Thermal risk evaluation of concentrated electrolytes for Li-ion batteries
title_fullStr	Thermal risk evaluation of concentrated electrolytes for Li-ion batteries
title_full_unstemmed	Thermal risk evaluation of concentrated electrolytes for Li-ion batteries
title_sort	thermal risk evaluation of concentrated electrolytes for li-ion batteries
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/147ac3cb2ced401d8d12226b8452425e
work_keys_str_mv	AT liweizhao thermalriskevaluationofconcentratedelectrolytesforliionbatteries AT atsushiinoishi thermalriskevaluationofconcentratedelectrolytesforliionbatteries AT shigetookada thermalriskevaluationofconcentratedelectrolytesforliionbatteries
_version_	1718409762336407552

Thermal risk evaluation of concentrated electrolytes for Li-ion batteries

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