Investigation on gas generation and corresponding explosion characteristics of lithium-ion batteries during thermal runaway at different charge states

被引:10
作者
Zhang, Jiabo [1 ]
Guo, Qianzhen [1 ]
Liu, Shaoyan [3 ]
Zhou, Chao [1 ]
Huang, Zhen [1 ,2 ]
Han, Dong [1 ,2 ]
机构
[1] Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn, Minist Educ, Shanghai 200240, Peoples R China
[2] Shanghai Noncarbon Energy Convers & Utilizat Inst, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, China UK Low Carbon Coll, Shanghai 200240, Peoples R China
基金
中国国家自然科学基金;
关键词
Lithium-ion battery safety; Thermal runaway; State of charge; Gas generation; Explosion limit; LINI1/3MN1/3CO1/3O2 CATHODE MATERIAL; SAFETY; MECHANISMS; CELLS; FIRE;
D O I
10.1016/j.est.2023.110201
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
This study investigates the gas generation characteristics and explosion limits of the gas generated by 18650type LiNi1/3Co1/3Mn1/3O2 (NCM) cells during thermal runaway (TR) at different states of charge (SOCs). An accelerating rate calorimeter is employed to initialize TR, together with an airtight jar for gas measurement. Based on the detected gas composition for NCM cells, the corresponding explosion limits are computed and further compared with those of LiFePO4 (LFP) and LiNi0.80Co0.15Al0.05O2 (NCA) cells. The results reveal that the gas generation rates are slightly higher for NCM cells with lower SOCs prior to the violent TR processes compared to those for high-SOC cells, primarily due to the elevated reaction temperature. Moreover, during violent TR, multiple-peak features are observed for the gas generation rate curves, especially at high-SOC conditions. On the other hand, typical Z-shaped explosion limit curves are observed for all generated mixtures. As the cathode material varies from NCM to LFP and NCA, the explosion limits shift from high-temperature regions to low-temperature regions. In contrast to common beliefs that the generation gas at high SOCs is more explosive, non-monotonic responses of the explosion limit curves are found with respect to cell SOC. The significance of minor components of the generated gas, including ethylene and ethane, in reducing the explosivity of the mixture, is highlighted through sensitivity analyses.
引用
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页数:11
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