The disassembly analysis and thermal runaway characteristics of NCM811 family battery cells

IF 3 3区工程技术 Q2 CHEMISTRY, ANALYTICAL

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-12-26 DOI:10.1007/s10973-024-13939-2

Aiwen Guo, Zhixiang Xing, Yanyan Liu, Wanzheng Lu, Aoqi Wang, Jie Wu, Guoqiang Chai, Yaqing Shi, Juncheng Jiang, Yanan Ma

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Abstract

Lithium-ion batteries are susceptible to thermal runaway during thermal abuse, potentially resulting in safety hazards such as fire and explosion. Therefore, it is crucial to investigate the internal thermal stability and characteristics of thermal runaway in battery pouch cells. This study focuses on dismantling a power lithium-ion battery, identified as Ni-rich LiNi_xCo_yMn_1-x-yO₂ (NCM811, LiNi_0.83Co_0.12Mn_0.05O₂) lithium-ion battery pouch cell through material characterization methods. The authors delve into the stability of the main component materials of lithium-ion cells and the mechanism of the thermal runaway induced by the cells. In addition, thermal runaway experiments are conducted under overheating conditions to analyze the effect of different states of charge (SOC) levels on battery cell temperature and gas changes. This information can serve as an active safety warning signal and allow for an extended window for passive safety measures. In conclusion, (i) uniform internal porosity facilitates efficient Li-ion diffusion. (ii) Thermal stability hierarchy: cathode > anode > separator. (iii) The elevated SOC levels expand risks, necessitating integrated monitoring of temperature, thermal ramp rate, and CO evolution for precise hazard alerts.

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来源期刊

Journal of Thermal Analysis and Calorimetry 化学-分析化学

CiteScore

8.50

自引率

9.10%

发文量

577

审稿时长

3.8 months

期刊介绍： Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.