X射线光电子能谱
电解质
钝化
电化学
溶剂
化学
电极
化学工程
降级(电信)
盐(化学)
电池(电)
无机化学
材料科学
图层(电子)
有机化学
物理化学
物理
工程类
功率(物理)
计算机科学
电信
量子力学
作者
Ali Darwiche,Lucille Bodenes,Lénaïc Madec,Laure Monconduit,Hervé Martínez
标识
DOI:10.1016/j.electacta.2016.03.089
摘要
A thorough X-ray photoelectron spectroscopy (XPS) is carried out on the Sb/Na electrochemical cell to rationalize the different electrochemical performances in terms of irreversible capacity on first cycle, cumulated capacity losses, reversible capacity and capacity retention. Surface analysis of Sb electrode cycled versus sodium using three different electrolyte formulations by changing the nature of the salt (NaClO4 or NaPF6) and the nature of the solvents (PC or EC/DMC mixture) was performed by a combined XPS core peaks and quantification data analysis to establish the main components of the solid electrolyte interphase film (SEI) and its evolution on cycling. The passivation layer formed during cycling is mainly constituted of carbonates, Na2CO3 and alkylcarbonates, that appear during the discharge after the preferential deposition of NaF from the degradation of FEC. The solvent appears to have a key role, and the NaClO4/PC electrolyte, despite the high viscosity of its solvent gives the best compromise in terms of performances by forming a stable and thick SEI at the surface of all components of the composite electrode.
科研通智能强力驱动
Strongly Powered by AbleSci AI