Investigating the critical characteristics of thermal runaway process for LiFePO4/graphite batteries by a ceased segmented method
Xuan Tang,
Guangxu Zhang,
Xueyuan Wang,
Gang Wei,
Guangshuai Han,
Jiangong Zhu,
Xuezhe Wei,
Haifeng Dai
Affiliations
Xuan Tang
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; School of Automotive Studies, Tongji University, Shanghai 201804, China
Guangxu Zhang
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; School of Automotive Studies, Tongji University, Shanghai 201804, China
Xueyuan Wang
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; School of Automotive Studies, Tongji University, Shanghai 201804, China
Gang Wei
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; School of Automotive Studies, Tongji University, Shanghai 201804, China
Guangshuai Han
Institute for Advanced Study, Tongji University, Shanghai 200092, China; Shanghai AI NEV Innovative Platform Co., Ltd., Shanghai 201804, China
Jiangong Zhu
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen 76344, Germany
Xuezhe Wei
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; School of Automotive Studies, Tongji University, Shanghai 201804, China; Corresponding author
Haifeng Dai
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China; School of Automotive Studies, Tongji University, Shanghai 201804, China; Corresponding author
Summary: Lithium-ion batteries (LIBs) are widely used as the energy carrier in our daily life. However, the higher energy density of LIBs results in poor safety performance. Thermal runaway (TR) is the critical problem which hinders the further application of LIBs. Clarifying the mechanism of TR evolution is beneficial to safer cell design and safety management. In this paper, liquid nitrogen spray is proved to be an effective way to stop the violent reaction of LIBs during the TR process. Based on extended-volume accelerating rate calorimetry, the liquid nitrogen ceasing combined with non-atmospheric exposure analysis is used to investigate the TR evolution about LiFePO4/graphite batteries at critical temperature. Specifically, the geometrical shape, voltage, and impedance change are monitored during the TR process on the cell level. The morphologies/constitution of electrodes and separators are presented on the component level. Utilizing the gas analysis, the failure mechanism of the prismatic LiFePO4/graphite battery is studied comprehensively.
