| Citation: | ZHANG Q S，QU Y R. Research on toxicity of gases of thermal runaway released from ternary lithium-ion batteries featuring cyclic aging process[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（6）：1761-1769 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0534
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Thermal abuse experiments were carried out on ternary lithium-ion batteries with a range of cyclic aging degrees in order to investigate the changes in thermal runaway characteristics and the harmful effects of released gases during the cyclic aging process of high-energy-density lithium-ion batteries. Additionally, a gas sensor array was used to carry out quantitative analysis on the toxicity of pyrolysis gases based on fraction model of effective dose. The results demonstrated that the ternary lithium-ion battery with high nickel content was equipped with poor cyclic performance since the health state of the battery was lower than 70% after 200 cycles of aging. Aging batteries tended to transform into a state of thermal runaway, which reacted more drastically with less energy released, consequently, the combustion efficiency of the released gas is low. The detriments of asphyxiating gases released during the thermal runaway of batteries were more harmful than irritating gases in a confined space, and the cumulative effect of asphyxiating gas toxicity of batteries after 150 times of cyclic aging process tended to reach the critical value, which is one, 638 s earlier than fresh batteries. With the aging degree increasing, immediate toxic effects of irritant gases and immediate effects of gas lethal toxicity weakened. Compared with fresh batteries, immediate toxic effects of irritant gases after 100 times of cyclic aging process decreased by 0.34, and immediate effects of gas lethal toxicity decreased by 0.19. The study’s findings can offer data support for the assessment of safety and the aging process’s thermal runaway warning.
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