Abstract The impact of different formulation methods, involving related process technologies, as well as the influence of dispersing intensity on the structural and electrical coating layer properties of LiMn2O4/LiNi0,80Co0,15Al0,05O2 (LMS/NCA) blends are studied. Findings are finally correlated with the electrochemical rate-capability in order to derive process-structure–property functions to facilitate systematical electrode development. LMS was found to be sensitive according mechanical stress but by processing LMS/NCA blend electrodes this problem can be avoided. In general carbon black (CB) agglomerate size and its distribution in the binder network were identified to be significant factors influencing rate-capability. Both were found to influence pore structure by utilizing representative low and high energy methods for the formulation of the suspensions. The specific pore volume in the pore size region of 10 μm ≥ dp ≥ 0.5 μm was discovered to strongly influence rate-capability. These highways for lithium-ion transport allow for higher mass of lithium-ions per unit time penetrating into the inner surface of the coating layer. Specific volume and thus rate-performance can either be increased by a binder solution based formulation method or by decreasing the specific energy input during dispersing process. Hence no superior formulation method exists. The adjustment of mixing intensity and therewith the achieved CB agglomerate size, referring to the formulation method used, is essential. Thus comparable electrochemical rate performance was found for the same specific volume of approximately 0.25 cc g−1 but for different dispersing intensities. Further, the pore size region of 1.5 μm > dp > 0.03 μm was identified to be characteristic for the CB agglomerate size and the corresponding CB treatment method used. Peakedness of the pore size distribution was found to follow electrode conductivity which was the largest for a distributive dry mixing method. For electrodes showing a good CB agglomerate distribution in the binder network rate-capability was found to be limited by the pore structure of the coating layer and, thus, preliminarily by the corresponding ion transport kinetic. Based on the findings a model concept on processes occurring during dispersing was proposed and discussed to describe viscosity evolution over dispersing time.

中文翻译：

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配方方法和相关工艺对 LMS/NCA 混合电极的结构、电学和电化学性能的影响

摘要 研究了不同配方方法的影响，涉及相关工艺技术，以及分散强度对LiMn2O4/LiNi0,80Co0,15Al0,05O2（LMS/NCA）共混物结构和电涂层性能的影响。结果最终与电化学倍率能力相关，以推导出过程-结构-性能函数，以促进系统电极的开发。发现 LMS 对机械应力很敏感，但通过处理 LMS/NCA 混合电极可以避免这个问题。一般来说，炭黑 (CB) 团聚体尺寸及其在粘合剂网络中的分布被认为是影响速率能力的重要因素。发现两者都通过使用代表性的低能和高能方法来配制悬浮液来影响孔结构。发现 10 μm ≥ dp ≥ 0.5 μm 孔径区域中的比孔体积对倍率能力有很大影响。这些用于锂离子传输的高速公路允许单位时间内更高质量的锂离子渗透到涂层的内表面。比体积和倍率性能可以通过基于粘合剂溶液的配方方法或通过降低分散过程中的比能量输入来增加。因此不存在优越的配制方法。根据所使用的配方方法，调整混合强度以及由此达到的 CB 团聚体尺寸是必不可少的。因此，对于大约 0.25 cc g-1 的相同比容，但对于不同的分散强度，发现了可比的电化学倍率性能。此外，1.5 μm > dp > 0.03 μm 的孔径区域被确定为 CB 团聚体尺寸和所用相应 CB 处理方法的特征。发现孔径分布的峰值跟随电极电导率，这是分布干混法最大的。对于在粘合剂网络中显示出良好 CB 附聚物分布的电极，发现速率能力受涂层的孔结构限制，因此，初步受相应的离子传输动力学限制。