Probing component contributions and internal polarization in silicon-graphite composite anode for lithium-ion batteries with an electrochemical-mechanical model

doi:10.1088/1674-1056/ac6012

中国物理B ›› 2022, Vol. 31 ›› Issue (7): 78201-078201.doi: 10.1088/1674-1056/ac6012

Probing component contributions and internal polarization in silicon-graphite composite anode for lithium-ion batteries with an electrochemical-mechanical model

Yue Chen(陈约)^1,2, Fuliang Guo(郭福亮)^1,2, Lufeng Yang(杨陆峰)¹, Jiaze Lu(卢嘉泽)¹, Danna Liu(刘丹娜)³, Huayu Wang(王华宇)^4,5, Jieyun Zheng(郑杰允)¹, Xiqian Yu(禹习谦)¹, and Hong Li(李泓)^1,2,3,5,†

1 Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Beijing WeLion New Energy Technology Co., Ltd., Beijing 100176, China;
4 Li Auto Inc., Beijing 101399, China;
5 Tianmu Lake Institute of Advanced Energy Storage Technologies, Liyang 213300, China

收稿日期:2022-01-10 修回日期:2022-02-14 接受日期:2022-03-23 出版日期:2022-06-09 发布日期:2022-06-13
通讯作者: Hong Li E-mail:hli@iphy.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFE0100200), the National Natural Science Foundation of China (Grant No. U1964205), and the Beijing Municipal Science and Technology Commission (Grant No. Z191100004719001).

Probing component contributions and internal polarization in silicon-graphite composite anode for lithium-ion batteries with an electrochemical-mechanical model

1 Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Beijing WeLion New Energy Technology Co., Ltd., Beijing 100176, China;
4 Li Auto Inc., Beijing 101399, China;
5 Tianmu Lake Institute of Advanced Energy Storage Technologies, Liyang 213300, China

Received:2022-01-10 Revised:2022-02-14 Accepted:2022-03-23 Online:2022-06-09 Published:2022-06-13
Contact: Hong Li E-mail:hli@iphy.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFE0100200), the National Natural Science Foundation of China (Grant No. U1964205), and the Beijing Municipal Science and Technology Commission (Grant No. Z191100004719001).

1. 附件.pdf(222KB)

摘要/Abstract

摘要： Silicon-graphite (Si-Gr) composite anodes are attractive alternatives to replace Gr anodes for lithium-ion batteries (LIBs) owing to their relatively high capacity and mild volume change. However, it is difficult to understand electrochemical interactions of Si and Gr in Si-Gr composite anodes and internal polarization of LIBs with regular experiment methods. Herein, we establish an electrochemical-mechanical coupled model to study the effect of rate and Si content on the electrochemical and stress behavior in a Si-Gr composite anode. The results show that the composites of Si and Gr not only improve the lithiation kinetics of Gr but also alleviate the voltage hysteresis of Si and decrease the risk of lithium plating in the negative electrode. What's more, the Si content is a tradeoff between electrode capacity and electrode volume variation. Further, various internal polarization contributions of cells using Si-Gr composite anodes are quantified by the voltage decomposition method. The results indicate that the electrochemical polarization of electrode materials and the electrolyte ohmic over-potential are dominant factors in the rate performance of cells, which provides theoretical guidance for improving the rate performance of LIBs using Si-Gr composite anodes.

关键词: Si-Gr, electrochemical interactions, polarization, rate performance

Abstract: Silicon-graphite (Si-Gr) composite anodes are attractive alternatives to replace Gr anodes for lithium-ion batteries (LIBs) owing to their relatively high capacity and mild volume change. However, it is difficult to understand electrochemical interactions of Si and Gr in Si-Gr composite anodes and internal polarization of LIBs with regular experiment methods. Herein, we establish an electrochemical-mechanical coupled model to study the effect of rate and Si content on the electrochemical and stress behavior in a Si-Gr composite anode. The results show that the composites of Si and Gr not only improve the lithiation kinetics of Gr but also alleviate the voltage hysteresis of Si and decrease the risk of lithium plating in the negative electrode. What's more, the Si content is a tradeoff between electrode capacity and electrode volume variation. Further, various internal polarization contributions of cells using Si-Gr composite anodes are quantified by the voltage decomposition method. The results indicate that the electrochemical polarization of electrode materials and the electrolyte ohmic over-potential are dominant factors in the rate performance of cells, which provides theoretical guidance for improving the rate performance of LIBs using Si-Gr composite anodes.

Key words: Si-Gr, electrochemical interactions, polarization, rate performance

中图分类号: (Lithium-ion batteries)

82.47.Aa

65.40.gk (Electrochemical properties) 82.45.Fk (Electrodes)

Yue Chen(陈约), Fuliang Guo(郭福亮), Lufeng Yang(杨陆峰), Jiaze Lu(卢嘉泽), Danna Liu(刘丹娜), Huayu Wang(王华宇), Jieyun Zheng(郑杰允), Xiqian Yu(禹习谦), and Hong Li(李泓). Probing component contributions and internal polarization in silicon-graphite composite anode for lithium-ion batteries with an electrochemical-mechanical model[J]. 中国物理B, 2022, 31(7): 78201-078201.

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Probing component contributions and internal polarization in silicon-graphite composite anode for lithium-ion batteries with an electrochemical-mechanical model

Probing component contributions and internal polarization in silicon-graphite composite anode for lithium-ion batteries with an electrochemical-mechanical model

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