Experimental and modeling analysis of thermal runaway for LiNi0.5Mn0.3Co0.2O2/graphite pouch cell under adiabatic condition. (20th February 2021)

• Record Type: Journal Article
• Authors: Tang, Xuan; Wei, Xuezhe; Zhang, Haonan; Li, Dongjian; Zhang, Guangxu; Wang, Xueyuan; Zhu, Jiangong; Dai, Haifeng
• Is Part Of: International journal of energy research. Volume 45:Number 7(2021)
• Page Start: 10667
• Page End: 10681
• Publication Date: 2021-02-20
• Subjects: LiNi0.5Mn0.3Co0.2O2/graphite -- Lithium‐ion batteries -- lumped‐parameter thermal model -- pouch cell -- thermal runaway; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.6552
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The nickel‐rich lithium‐ion batteries (LIBs) are widely used as the energy source of new energy vehicles. But the relatively poor safety performance results in serious accidents, which attracts more and more attention of researchers. In this study, the thermal runaway (TR) features of a pouch cell consisted of LiNi0.5 Mn0.3 Co0.2 O2 /graphite are investigated by an extended volume‐accelerating rate calorimeter combined with resistance monitoring, voltage monitoring, and video imaging technologies. Based on these techniques, the TR process is divided into five representative stages, that is, the start of self‐heating, the venting of flammable gas, the volatilization of electrolyte, the melt of separator, and the internal short circuit of LIBs. Besides, a lumped‐parameter thermal model with high precision is developed to predict and explain the TR process. The heat generated by the decomposition of solid electrolyte interface (SEI), the reaction of anode‐electrolyte, the multiple phase transition of the cathode is considered as the main heating source of TR. The resistance shows a higher sensitivity to the SEI decomposition than temperature does. The venting process along with the evaporation of electrolytes provides significant opportunities to obstruct the TR. The interval time between voltage drop and temperature rise is 6.9 seconds, which is beneficial for the early warning of TR.