2022年8月24日 · We propose a fitting model for the XPS results in which FEC decomposition yields −C–O, DO (1,3-dioxolan-2-one), −CO 2 Li, Li 2 CO 3, and LiF. −C–O, DO, and −CO 2 Li are most probably incorporated in a cross-linked polymeric network. Due to its distinct chemical environments, detecting DO can be unambiguously linked to the presence ...

2020年12月20日 · To evaluate the strong chemical interaction between Fe 3 C and polysulfide, X-ray photoelectron spectroscopy (XPS) analysis was employed to identify the state of residual polysulfides remaining in contact with Fe 3 C.

2017年7月24日 · In this work we explore how an electrolyte additive (fluorinated ethylene carbonate – FEC) mediates the thickness and composition of the solid electrolyte interphase formed over a silicon anode...

2012年7月15日 · The figures show the addition of FEC can effectively increase the lithium ion conductivity of the SEI film and accelerate lithium ion movement through SEI film containing less LiF, which is consistent with the XPS spectra of F1s.

2018年4月10日 · The characterizations from scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) demonstrate that FEC facilitates the formation of stable solid electrolyte interfaces (SEI) simultaneously on anode and cathode of the LiCoO 2 /graphite pouch cells with ...

2018年7月7日 · Fluoroethylene carbonate (FEC), which is an effective electrolyte additive, can significantly enhance the cycle stability and lifespan of LIBs. Park and his coworkers made studies of 20 and 30 vol% FEC effect on the surface chemistry of the nano-sized amorphous molybdenum dioxide (a-MoO 2) cathode.

2019年6月14日 · In this work, we investigate the effect of VC and FEC on the SEI composition of graphite electrodes using surface sensitive analytical techniques such as XPS and FTIR spectroscopy. Using different model electrolytes, we take a …

We compared the cyclabilities of the graphite negative electrode with or without FEC additive with the use of the half-cell (Fig. S2). Despite the slight decline of cyclability, all samples had...

摘要 通过恒电流充放电测试和循环伏安法 (CV) 研究了氟代碳酸亚乙酯 (FEC) 对 LiCoO 2 正极电化学性能的影响。 发现 FEC 对循环稳定性有积极影响，并且还提高了电池性能。 我们还使用 X 射线光电子能谱 (XPS) 和二维相关光谱研究了 LiCoO 2 阴极上的固体电解质界面 (SEI) 膜。 二维相关 XPS 光谱表明，最初，聚偏二氟乙烯 (PVdF) 粘合剂和电解质组分分解，之后在 LiCoO 2 阴极表面上形成 SEI 组分。 在含 FEC 的电解液中，聚碳酸酯成分比不含 FEC 的电解液更丰富。 SEI …

2021年5月24日 · When FEC is used, the Na-metal electrode forms a multilayer SEI structure comprising an outer NaF-rich amorphous phase and an inner Na 3 PO 4 phase. This layered structure stabilizes the SEI and...