2024年1月25日 · 斯坦福大学鲍哲南教授团队 对三种不同的锂盐，即双 (氟磺酰基)酰亚胺锂 (LiFSI)、双 (三氟甲磺酰基)酰亚胺锂 (LiTFSI)和六氟磷酸锂 (LiPF6)进行了系统的XPS研究。 并排比较表明，组成元素的结合能敏感地随其不同的化学环境而变化。 引人注目的是，所有三种Li盐在 Ar+溅射 下一致转化为LiF，这表明在XPS分析之前完全去除盐的重要性。 发现有机溶剂残留物或样品表面至主体的杂质是溶剂-盐组合特有的，应与真正的有机SEI区分开。 总的来说，这组 …

2017年8月17日 · The synergism between LiPF 6 and LiBF 4 was explored using XPS, symmetric cells and EIS analysis. These show that LiBF 4 reduces impedance growth at the positive electrode, while LiPF 6 improves passivation at the negative electrode.

2024年6月21日 · XPS has been used to characterize the surfaces of carbon-coated Li2FeSiO4 cathodes extd. from Li-ion batteries in both a charged and discharged state. 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and lithium hexafluorophosphate (LiPF6) based electrolytes were used with ethylene carbonate (EC) and di-Et carbonate (DEC) as org. solvents.

2014年12月20日 · Surface layer on negative electrodes was investigated for LiPF 6 /EC–DMC electrolyte. In-situ X-ray reflectivity analyses etc revealed a surface layer (other than SEI). The layer was formed by a reductive decomposition of LiPF 6 around 2.6 V vs Li. Such an inactive surface layer influences the battery performance.

2016年3月29日 · Decomposition of carbonate electrolytes based on LiPF 6 eventually results in the formation of POF 3, which is readily detected and followed in situ during operation of Li-rich HE-NCM-based Li-ion cells.

2022年7月12日 · One of the most common techniques for characterizing Li metal SEI is X-ray photoelectron spectroscopy (XPS). Based on the photoelectric effect, XPS involves the use of photons to eject electrons from materials, with different elements and different atomic environments producing electrons of different kinetic energies. XPS is commonly used for ...

XPS spectra of the positive electrode in LiPF6/EC/EMC + VC (a) before, and (b) after high-temperature cycle tests. LiCoO2/graphite full-cells with a carbonate-free electrolyte based on lithium...

X-ray photoelectron valence spectra of lithium salts LiBF 4, LiPF 6, LiTFSI, and LiBETI have been recorded and analyzed by means of density functional theory (DFT) calculations, with good agreement between experimental and calculated spectra.

X-Ray photoelectron spectroscopy (XPS) has been used to characterise the surfaces of carbon-coated Li2FeSiO4 cathodes extracted from Li-ion batteries in both a charged and discharged state. 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and lithium hexafluorophosphate (LiPF6) based electrolytes were

Reaction of surface oxide, Li−Si alloying process, and passivation layer formation) has been investigated by photoelectron spectroscopy (XPS or PES). Both soft X-rays (hν=100−800 eV) and hard X-rays (hν=2000−7000 eV) from two different synchrotron facilities were used.