Silicon oxide-based materials are promising anode materials for the real application in lithium-ion batteries. The solid electrolyte interphase is vital for the cyclability and rate capability of the electrode material. Here, in this study, the effect of fluoroethylene carbonate (FEC) as the well-known electrolyte additive on the interface film formation of the commercial SiO/C anode was investigated. The potential-dependent morphology of the SEI layer were obtained via in situ atomic force microscopy (AFM) for the first two cycles and ex situ AFM for the 10th, 30th, and 50th cycles. The morphology analysis was complemented by the chemical composition evolution by ex situ X-ray photoelectron spectroscopy and Young’s modulus calculation via PeakForce quantitative nanomechanical mapping of AFM. The results indicated a dense, compact, and stiff SEI layer on the surface of SiO/C in FEC-based electrolyte, in contrast to the scattered and thin SEI layer in ethylene carbonate-based electrolyte.

中文翻译：

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碳酸氟乙烯酯对原位原子力显微镜观察到的SiO / C阳极固体电解质界面形成的影响

氧化硅基材料是真正用于锂离子电池的有前途的阳极材料。固体电解质界面对电极材料的循环性和倍率性能至关重要。在此，在这项研究中，研究了作为众所周知的电解质添加剂的碳酸氟亚乙酯（FEC）对商用SiO / C阳极界面膜形成的影响。通过前两个循环的原位原子力显微镜（AFM）和第10、30和50个循环的非原位AFM获得SEI层的电势依赖性形态。形态分析通过异位X射线光电子能谱的化学组成演变和通过AFM的PeakForce定量纳米机械作图计算的杨氏模量得到了补充。结果表明密实，紧凑，