Abstract
The large mechanical deformation induced by the lithiation/delithiation of silicon can induce rapid capacity fading of silicon-based lithium-ion battery. This work is focused on the development of a feasible stress-based charging protocol that can control the stress and deformation of silicon anode during electrochemical cycling from the stress analysis in a silicon particle. The stress-based charging protocol provides an approach to suppress the mechanical stress in silicon anode with the control of the upper cut-off voltage for delithiation. The numerical results reveal that applying a small upper cut-off voltage for delithiation can reduce the mechanical stress and lower the capacity of the silicon electrode, while it likely improves the performance of the silicon-based lithium-ion battery. Experimental study of silicon-based lithium-ion half cells reveals that applying a moderate cut-off voltage (600 mV in this work) achieves high reversible capacity and good cycling performance for all the C-rates tested in the work, and applying a large cut-off voltage of 1000 mV leads to the formation of large surface cracks and rapid capacity loss. The experimental results support the stress-based charging protocol, which is developed from the numerical analysis, that tuning the cut-off voltage can reduce the structural degradation and enhance the electrochemical performances of silicon-based lithium-ion battery.
Original language | English |
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Article number | 101765 |
Journal | Journal of Energy Storage |
Volume | 32 |
DOIs | |
State | Published - Dec 2020 |
Bibliographical note
Funding Information:The supports from National Natural Science Foundation of China under grant Nos. 11902222 (KZ), 11902073 (YL), and 11672210 (BZ) are gratefully acknowledged. K.Z. is thankful to Ningbo Zhengli New Energy Technology Co., Ltd. for its help in preparing the experiments, and Dr. Yiting Zheng of the Hong Kong University of Science and Technology for the constructive comments. This work is sponsored by “Chenguang Program” supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission under grant No. 19CG23 , and “the Fundamental Research Funds for the Central Universities” supported by Jiangsu Key Laboratory of Engineering Mechanics, Southeast University under grant No. LEM2001 .
Funding Information:
The supports from National Natural Science Foundation of China under grant Nos. 11902222 (KZ), 11902073 (YL), and 11672210 (BZ) are gratefully acknowledged. K.Z. is thankful to Ningbo Zhengli New Energy Technology Co. Ltd. for its help in preparing the experiments, and Dr. Yiting Zheng of the Hong Kong University of Science and Technology for the constructive comments. This work is sponsored by “Chenguang Program” supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission under grant No. 19CG23, and “the Fundamental Research Funds for the Central Universities” supported by Jiangsu Key Laboratory of Engineering Mechanics, Southeast University under grant No. LEM2001.
Publisher Copyright:
© 2020
Keywords
- Charging protocol
- Elastoplastic deformation
- Lithium-ion battery
- Mechanical stress
- Silicon electrode
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering