A multilayer spectroscopic ellipsometry (SE) model has been developed to characterize SEI formation. The model, which consists of two Cauchy layers, is constructed with an inner layer meant to model primarily inorganic compounds adjacent to an electrode and an outer layer which mirrors polymeric, organic constituents on the exterior of the SEI. Comparison of 1:1 EC:EMC and 1:4 EC:EMC with 1.0 M LiPF_6 shows distinct differences in the two modeled layers. The data suggest that the thickness of both layers change over a wide potential range. These changes have been linked with other reports on the growth of the SEI.
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机译:已经开发了多层光谱椭偏仪(SE)模型来表征SEI的形成。该模型由两层柯西层组成,其内部层主要用于模拟与电极相邻的无机化合物,而外部层则反映SEI外部的聚合有机成分。 1:1 EC:EMC和1:4 EC:EMC与1.0 M LiPF_6的比较显示了两个建模层的明显差异。数据表明两层的厚度在很宽的电位范围内变化。这些变化已与有关SEI增长的其他报告相关联。
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