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Effect of Young's modulus of active materials on ion transport through solid electrolyte in all-solid-state lithium-ion battery
Journal of Power Sources ( IF 9.2 ) Pub Date : 2020-11-18 , DOI: 10.1016/j.jpowsour.2020.229212
A. Ohashi , M. Kodama , N. Horikawa , S. Hirai

An all-solid-state lithium-ion battery with sulfide solid electrolyte is expected to be operated and fabricated under pressure to achieve high ionic conductivity. However, the varying mechanical properties of the constituent materials of composite electrodes generate a non-uniform stress distribution, which affects the ionic conductivity. Moreover, because of the presence of various active materials with different Young's moduli, the correlation between the Young's modulus of the active material and ion-conduction characteristics of a composite electrode is considered. In this study, to elucidate the effect of the Young's modulus of the active material on the ionic conductivity of a composite electrode, electrochemical impedance spectroscopy measurements and finite element method stress simulations based on X-ray computed tomography images are performed for model composite electrodes. The model composite electrodes are fabricated by mixing the solid electrolyte with zirconia or nylon in different volumetric fractions. The experimental results demonstrate that a composite electrode containing an active material with lower Young's modulus exhibits a higher ionic conductivity and lower saturation pressure. The finite element method stress simulation indicates that the change in the ion-conduction characteristics originates from the stress concentration induced by the active material's Young's modulus and volumetric fraction.



中文翻译:

活性材料的杨氏模量对全固态锂离子电池中离子通过固体电解质的迁移的影响

带有硫化物固体电解质的全固态锂离子电池有望在压力下运行和制造,以实现高离子电导率。然而,复合电极的组成材料的变化的机械性能会产生不均匀的应力分布,这会影响离子电导率。此外,由于存在具有不同杨氏模量的各种活性材料,因此考虑了活性材料的杨氏模量与复合电极的离子传导特性之间的相关性。在这项研究中,为了阐明活性材料的杨氏模量对复合电极离子电导率的影响,对模型复合电极进行了基于X射线计算机断层扫描图像的电化学阻抗谱测量和有限元方法应力模拟。通过将固体电解质与氧化锆或尼龙以不同的体积分数混合来制造模型复合电极。实验结果表明,包含具有较低杨氏模量的活性材料的复合电极表现出较高的离子电导率和较低的饱和压力。有限元方法应力模拟表明,离子传导特性的变化源自活性材料的杨氏模量和体积分数引起的应力集中。通过将固体电解质与氧化锆或尼龙以不同的体积分数混合来制造模型复合电极。实验结果表明,包含具有较低杨氏模量的活性材料的复合电极表现出较高的离子电导率和较低的饱和压力。有限元方法应力模拟表明,离子传导特性的变化源自活性材料的杨氏模量和体积分数引起的应力集中。通过将固体电解质与氧化锆或尼龙以不同的体积分数混合来制造模型复合电极。实验结果表明,包含具有较低杨氏模量的活性材料的复合电极表现出较高的离子电导率和较低的饱和压力。有限元方法应力模拟表明,离子传导特性的变化源自活性材料的杨氏模量和体积分数引起的应力集中。

更新日期:2020-11-19
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