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Influence of surface characteristics on the penetration rate of electrolytes into model cells for lithium ion batteries
Journal of Adhesion Science and Technology ( IF 2.3 ) Pub Date : 2019-11-08 , DOI: 10.1080/01694243.2019.1686831
Sebastian Beyer 1, 2 , Oliver Kobsch 1 , Doris Pospiech 1 , Frank Simon 1 , Christian Peter 3 , Kristian Nikolowski 3 , Mareike Wolter 3 , Brigitte Voit 1, 4
Affiliation  

Abstract Filling of cells with liquid electrolytes is the time-determining step in the production of lithium-ion batteries (LIBs). The influencing factors are not completely understood and need further research. The adhesion of the solid components, i.e. anode, cathode and separators, to the electrolyte and the respective interfaces play an important role. In this study, the penetration of liquid electrolytes is monitored by a combination of tensiometry and chronoamperometry. A setup including all battery components is proposed as model for battery cells. Diethyl carbonate is employed as model for the electrolyte. The penetration rates of the liquid into a stepwise extended model setup (separator; anode; cathode; separator/anode; separator/cathode; and anode/separator/cathode) in confined geometry between glass plates are determined with reproducible results. A modified Washburn equation combining surface tensions of liquid and solids forming the interface, and complex geometries of separators and electrodes is used to develop the penetration model. Comparative measurements in a glove box yield comparable results with the real electrolyte solution. The penetration of the model electrolyte into ceramic-coated separators is significantly faster than into polyolefin separators due to higher surface roughness and higher polarity of ceramic-coated separators. The wetting times obtained by chronoamperometric measurements correlate with the tensiometric penetration rates. The higher the tensiometric penetration rate, the lower is the chronoamperometric wetting time. The results of the study contribute to a deeper understanding of the interactions between electrolyte and solid components in LIBs and provide a new method to pre-evaluate battery components.

中文翻译:

表面特性对电解质渗入锂离子电池模型电池的影响

摘要 用液体电解质填充电池是锂离子电池 (LIB) 生产中的时间决定步骤。影响因素尚未完全了解,需要进一步研究。固体组分,即阳极、阴极和隔板,对电解质和各自界面的粘附起着重要作用。在这项研究中,液体电解质的渗透通过张力测定法和计时电流法的组合进行监测。建议将包括所有电池组件的设置作为电池单元的模型。碳酸二乙酯用作电解质的模型。液体在逐步扩展的模型设置中的渗透率(隔板;阳极;阴极;隔板/阳极;隔板/阴极;和阳极/隔板/阴极)在玻璃板之间的受限几何形状中确定具有可重复的结果。改进的沃什伯恩方程结合了形成界面的液体和固体的表面张力,以及分离器和电极的复杂几何形状,用于开发渗透模型。手套箱中的比较测量产生与实际电解质溶液相当的结果。由于陶瓷涂层隔膜具有更高的表面粗糙度和更高的极性,模型电解质渗透到陶瓷涂层隔膜中的速度明显快于聚烯烃隔膜。通过计时电流测量获得的润湿时间与张力渗透率相关。张力渗透率越高,计时电流法润湿时间越低。
更新日期:2019-11-08
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