Volume 46, Issue 3 pp. 2633-2654
RESEARCH ARTICLE

Estimation of NCM111/graphite acoustic properties under different lithium stoichiometry based on nondestructive acoustic in situ testing

Mengchao Yi

Mengchao Yi

College of Engineering, China Agricultural University, Beijing, China

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, China

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Fachao Jiang

Corresponding Author

Fachao Jiang

College of Engineering, China Agricultural University, Beijing, China

Correspondence

Fachao Jiang, College of Engineering, China Agricultural University, Beijing, 100083, China.

Email: [email protected]

Languang Lu, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, 100084, China.

Email: [email protected]

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Languang Lu

Corresponding Author

Languang Lu

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, China

Correspondence

Fachao Jiang, College of Engineering, China Agricultural University, Beijing, 100083, China.

Email: [email protected]

Languang Lu, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, 100084, China.

Email: [email protected]

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Jianqiao Ren

Jianqiao Ren

R&D China, Électricité de France, Beijing, China

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Mingxin Jin

Mingxin Jin

College of Engineering, China Agricultural University, Beijing, China

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Yuebo Yuan

Yuebo Yuan

School of Vehicle and Mobility, Tsinghua University, Beijing, China

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Yong Xiang

Yong Xiang

Test Machine R&D Department, Solid(Beijing) Technology Co.,Ltd., Beijing, China

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Xiaofeng Geng

Xiaofeng Geng

Test Machine R&D Department, Solid(Beijing) Technology Co.,Ltd., Beijing, China

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Xingong Zhang

Xingong Zhang

Test Machine R&D Department, Solid(Beijing) Technology Co.,Ltd., Beijing, China

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Xuebing Han

Xuebing Han

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, China

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Minggao Ouyang

Minggao Ouyang

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, China

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First published: 11 October 2021
Citations: 9

Funding information: Électricité de France; Natural Science Foundation of Beijing Municipality, Grant/Award Number: 3212031; Beijing Natural Science Foundation, Grant/Award Number: 3212031; National Natural Science Foundation of China, Grant/Award Numbers: 51807108, 52037006; Électricité de France R&D China; International Science & Technology Cooperation of China, Grant/Award Number: 2019YFE0100200

Summary

Lithium (Li)-ion battery is an important energy storage for electronic production and electric vehicles. Battery aging is accompanied by a state change in the active material. The method of active material status evaluation in a nondestructive way has become a major topic in battery research. In this study, a battery in situ testing with multiple noncontact ultrasonic excitation signal methodology is proposed, and for the first time to use acoustic energy to analysis signal transmittance and reflectance. Based on a 1/20C charging and discharging experiment of commercial NCM111 pouch battery, the deformation, density, wave speed, acoustic impedance, and other parameters of NCM111/graphite material under different Li stoichiometry are estimated. Acoustic property of active material has been used as a medium to explain the mechanism of ultrasonic signal changes. The experiment result shows that acoustic energy is highly correlated with the calculated acoustic impedance of the active material, and there is no accurate correspondence with battery voltage and capacity. Ultrasonic is an effective method to study the status of Li battery.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

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