3rd ISLBFS 2023 特邀嘉宾 | 崔光磊 研究员

崔光磊 研究员

中国科学院青岛生物能源与过程研究所

Title: Revealing the thermal runaway mechanism of high energy density lithium ion Batteries

Venue: Johnson Hall, Howard Johnson Kangda Plaza Qingdao

报告摘要 | Abstract

The ever-growing “endurance mileage” anxiety has been stimulating the continuous energy density raising of conventional Li-ion batteries (LIBs), but the pace of thermal safety assessment is obviously lagged behind. [1-2] Until now, due to the complexity of exothermic chain reactions inside LIBs and the limitation of the existing testing approaches for thermal safety evaluation, it is still difficult to obtain a clear and accurate thermal runaway route map depicting the rooted interactions among cathode, anode, electrolyte and separator. [3] 

Herein, by combining varied in situ characterizations and post-test analyses, we investigate the inherent factors triggering the exothermic reaction chain inside the batteries. Gas generation and the complex electrodes cross talk are confirmed by a self-designed two-reaction ball device in this study. Results show that LiH exists in the graphite anode, and the LiH/electrolyte exothermic reactions, as well as H2 migration from anode to cathode side is proved to contribute on triggering the thermal runaway of the pouch cell. In addition, the roles of Li salt and solvents in electrolyte on the exothermic reaction are deciphered, and it is evidenced that carbonate solvents present critical effect on starting and accelerating the chain reactions. At last, the O2-releasing behavior and self-heating of delithiated nickel-rich layered oxide cathode is analyzed, and the related gas producing process is recorded and investigated by an in situ accelerating rate calorimeter- mass spectrum device, and the gassing process greatly influenced the burning behavior and the total heat releases.

In conclusion, the thermal runaway route of high energy density lithium ion batteries is revealed by a top-down strategy, from pouch cell to materials level, and the different roles of anode, electrolyte, cathode, and their interactions on determining the thermal runaway process under abused conditions are deciphered. Anode related reactions are the trigger factors of the cell self-heating, while the gas generation and cross talk is the one contributing to the rapid temperature increase.

References

[1] G. Xu, J. Li, C. Wang, X. Du, D. Lu, B. Xie, X. Wang, C. Lu, H. Liu, S. Dong, G. Cui, Angew. Chem. Int. Ed., 60 (2021), 7770.

[2] L. Huang, T. Lu, G. Xu, X. Zhang, B. Xie, B. Han, G. Cui, Chen, L, Joule, 6 (2022), 906-922.

[3] X. Zhang, L. Huang, B. Xie, S. Zhang, Z. Jiang, G. Xu, J. Li, G. Cui, Adv. Energy Mater., (2023) 2203648. 

嘉宾简介 | Curriculum Vitae

Guanglei Cui is currently a leading principal investigator at Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences. He completed his Ph.D. at the Institute of Chemistry of the Chinese Academy of Sciences in 2005, and then worked as a postdoctoral scientist at the Max Planck Institutes for Polymer Research and Solid State Research with Prof. Klaus Mllen and Prof. Joachim Maier from 2005 to 2009. He was a recipient of the National Natural Science Fund for Distinguished Young Scholars of China in 2016 and became a chief scientist of the National Key R&D Program of China in 2018. Prof. Cui is mainly focused on research topics about next-generation energy storage materials and devices, and he has published many highly cited peer-reviewed papers in journals such as Nat. Commun., Joule, J. Am. Chem. Soc., Angew. Chem. Int. Ed., Adv. Mater. and Environ. Energy Science. 

ISLBFS 2023 | 特邀嘉宾总览

（点击上方或嘉宾姓名可跳转至相应文章）

清华大学

中国科学院院士

University of Surrey, UK

崔光磊 研究员

中国科学院青岛生物能源与过程研究所

Jonna Hynynen 博士

Research Institutes of Sweden, RISE

王志荣 教授

南京工业大学应急管理学院

Barai Anup 副教授

The University of Warwick, UK

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