Applied Mathematics and Mechanics (English Edition) ›› 2023, Vol. 44 ›› Issue (2): 189-206.doi: https://doi.org/10.1007/s10483-023-2920-7

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Electro-chemo-mechanical analysis of the effect of bending deformation on the interface of flexible solid-state battery

Yutao SHI1, Chengjun XU1, Bingbing CHEN2, Jianqiu ZHOU2, Rui CAI3   

  1. 1. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210000, China;
    2. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 210000, China;
    3. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • 收稿日期:2022-04-07 修回日期:2022-11-17 发布日期:2023-02-04
  • 通讯作者: Jianqiu ZHOU, E-mail: zhouj@njtech.edu.cn
  • 基金资助:
    the National Natural Science Foundation of China (No. 11902144), the Postgraduate Research & Practice Innovation Program of Jiangsu Province of China (No. KYCX20 1074), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 19KJB430022), and the Guizhou Provincial General Undergraduate Higher Education Technology Supporting Talent Support Program (No. KY(2018)043)

Electro-chemo-mechanical analysis of the effect of bending deformation on the interface of flexible solid-state battery

Yutao SHI1, Chengjun XU1, Bingbing CHEN2, Jianqiu ZHOU2, Rui CAI3   

  1. 1. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210000, China;
    2. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 210000, China;
    3. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • Received:2022-04-07 Revised:2022-11-17 Published:2023-02-04
  • Contact: Jianqiu ZHOU, E-mail: zhouj@njtech.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (No. 11902144), the Postgraduate Research & Practice Innovation Program of Jiangsu Province of China (No. KYCX20 1074), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 19KJB430022), and the Guizhou Provincial General Undergraduate Higher Education Technology Supporting Talent Support Program (No. KY(2018)043)

摘要: Flexible solid-state battery has several unique characteristics including high flexibility, easy portability, and high safety, which may have broad application prospects in new technology products such as rollup displays, power implantable medical devices, and wearable equipments. The interfacial mechanical and electrochemical problems caused by bending deformation, resulting in the battery damage and failure, are particularly interesting. Herein, a fully coupled electro-chemo-mechanical model is developed based on the actual solid-state battery structure. Concentration-dependent material parameters, stress-dependent diffusion, and potential shift are considered. According to four bending forms (k = 8/mm, 0/mm, -8/mm, and free), the results show that the negative curvature bending is beneficial to reducing the plastic strain during charging/discharging, while the positive curvature is detrimental. However, with respect to the electrochemical performance, the negative curvature bending creates a negative potential shift, which causes the battery to reach the cut-off voltage earlier and results in capacity loss. These results enlighten us that suitable electrode materials and charging strategy can be tailored to reduce plastic deformation and improve battery capacity for different forms of battery bending.

关键词: solid-state battery, electro-chemo-mechanical coupling model, bending deformation, phase-transformation, plastic deformation

Abstract: Flexible solid-state battery has several unique characteristics including high flexibility, easy portability, and high safety, which may have broad application prospects in new technology products such as rollup displays, power implantable medical devices, and wearable equipments. The interfacial mechanical and electrochemical problems caused by bending deformation, resulting in the battery damage and failure, are particularly interesting. Herein, a fully coupled electro-chemo-mechanical model is developed based on the actual solid-state battery structure. Concentration-dependent material parameters, stress-dependent diffusion, and potential shift are considered. According to four bending forms (k = 8/mm, 0/mm, -8/mm, and free), the results show that the negative curvature bending is beneficial to reducing the plastic strain during charging/discharging, while the positive curvature is detrimental. However, with respect to the electrochemical performance, the negative curvature bending creates a negative potential shift, which causes the battery to reach the cut-off voltage earlier and results in capacity loss. These results enlighten us that suitable electrode materials and charging strategy can be tailored to reduce plastic deformation and improve battery capacity for different forms of battery bending.

Key words: solid-state battery, electro-chemo-mechanical coupling model, bending deformation, phase-transformation, plastic deformation

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