首页|Characterization and quantification of multi-field coupling in lithium-ion batteries under mechanical constraints

Characterization and quantification of multi-field coupling in lithium-ion batteries under mechanical constraints

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The safety and durability of lithium-ion batteries under mechanical constraints depend significantly on electrochemical,thermal,and mechanical fields in applications.Characterizing and quantifying the multi-field coupling behaviors requires interdisciplinary efforts.Here,we design experiments under mechanical constraints and introduce an in-situ analytical framework to clarify the complex interaction mechanisms and coupling degrees among multi-physics fields.The proposed analytical framework inte-grates the parameterization of equivalent models,in-situ mechanical analysis,and quantitative assess-ment of coupling behavior.The results indicate that the significant impact of pressure on impedance at low temperatures results from the diffusion-controlled step,enhancing kinetics when external pres-sure,like 180 to 240 kPa at 10 ℃,is applied.The diversity in control steps for the electrochemical reaction accounts for the varying impact of pressure on battery performance across different temperatures.The thermal expansion rate suggests that the swelling force varies by less than 1.60％per unit of elevated temperature during the lithiation process.By introducing a composite metric,we quantify the coupling correlation and intensity between characteristic parameters and physical fields,uncovering the highest coupling degree in electrochemical-thermal fields.These results underscore the potential of analytical approaches in revealing the mechanisms of interaction among multi-fields,with the goal of enhancing battery performance and advancing battery management.

Lithium-ion batteryMuti-field couplingMechanical constraintsInteraction mechanismsQuantitative analysis

Xue Cai、Caiping Zhang、Zeping Chen、Linjing Zhang、Dirk Uwe Sauer、Weihan Li

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National Active Distribution Network Technology Research Center,Beijing Jiaotong University,Beijing 100044,China

Chair for Electrochemical Energy Conversion and Storage Systems,Institute for Power Electronics and Electrical Drives(ISEA),RWTH Aachen University,Campus Boulevard 89,52074 Aachen,Germany

Center for Ageing,Reliability and Lifetime Prediction of Electrochemical and Power Electronic Systems(CARL),Campus-Boulevard 89,52074 Aachen,Germany

Juelich Aachen Research Alliance,JARA-Energy,Aachen,Germany

Helmholtz Institute Münster(HI MS),IEK-12,Forschungszentrum Jülich,Germany

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National Science Fund for Excellent Youth Scholars of ChinaNational Natural Science Foundation of China

5222270851977007

2024

10.1016/j.jechem.2024.03.048

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)
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