Thermal Runaway of Lithium-Ion Batteries Employing Flame-Retardant Fluorinated Electrolytes  

作　　者：Junxian Hou Li Wang Xuning Feng Junpei Terada Languang Lu Shigeaki Yamazaki Anyu Su Yoshiko Kuwajima Yongjiang Chen Tomoya Hidaka Xiangming He Hewu Wang Minggao Ouyang 

机构地区：[1]State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China [2]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China [3]Daikin Industries,Ltd.,1-1,Nishi-Hitotsuya,Settsu Osaka 566-8585,Japan [4]Sichuan New Energy Vehicle Innovation Center,Yibin 644002,China

出　　处：《Energy & Environmental Materials》2023年第1期333-339,共7页能源与环境材料（英文）

基　　金：This work is funded by National Natural Science Foundation of China(Grant No.52006115);Ministry of Science and Technology of China(Grant No.2019YFE0100200);National Natural Science Foundation of China(Grant No.52076121);China National Postdoctoral Program for Innovative Talents(Grant No.BX20190162);China Postdoctoral Science Foundation(Grant No.2019M660631);the Tsinghua University Initiative Scientific Research Program(Grant No.2019Z02UTY06).

摘　　要：Fluorinated electrolytes possess good antioxidant capacity that provides high compatibility to high-voltage cathode and flame retardance;thus,they are considered as a promising solution for advanced lithium-ion batteries carrying both high-energy density and high safety.Moreover,the fluorinated electrolytes are widely used to form stable electrolyte interphase,due to their chemical reactivity with lithiated graphite or lithium.However,the influence of this reactivity on the thermal safety of batteries is seldom discussed.Herein,we demonstrate that the flame-retardant fluorinated electrolytes help to reduce the flammability,while the lithium-ion batteries with flame-retardant fluorinated electrolytes still undergo thermal runaway and disclose their different thermal runaway pathway from that of battery with conventional electrolyte.The reduction in fluorinated components(e.g.,LiPF 6 and fluoroethylene carbonate(FEC))by fully lithiated graphite accounts for a significant heat release during battery thermal runaway.The 13%of total heat is sufficient to trigger the chain reactions during battery thermal runaway.This study deepens the understanding of the thermal runaway mechanism of lithium-ion batteries employing flame-retardant fluorinated electrolytes,providing guidance on the concept of electrolyte design for safer lithium-ion batteries.

关 键 词：battery safety flame retardance fluorinated electrolytes lithium-ion battery thermal runaway 

分 类 号：TM912[电气工程—电力电子与电力传动]