Study on X-ray Photoelectron Spectroscopy Testing Method of Solid Electrolyte Interphase
The solid electrolyte interphase(SEI)is crucial to the performance of secondary batteries.The composition and chemical state of SEI are usually determined using X-ray photoelectron spectroscopy(XPS).However,due to the complex composition and poor stability of SEI,its chemical state is highly susceptible to external conditions,leading to incorrect interpretations of battery mechanisms.This poses higher demands on the XPS testing method,and the authenticity of the SEI composition obtained by XPS tests are worth exploring.Moreover,during in-depth analysis,preferential sputtering can easily occur.It remains unknown whether the SEI composition remains stable during the sputtering process.In this paper,taking the SEI of lithium metal batteries as an example,combined with the actual test conditions,the influence of test location,X-ray,vacuum standing time and sputtering conditions on the XPS spectra was studied in detail.The results showed that different test locations yielded different SEI compositions.And the composition of SEI changed under vacuum.The sputtering caused the decomposition of SEI components,but SEI could remain stable under X-ray irradiation.Based on this,an XPS testing method suitable for the study of SEI in lithium metal batteries was proposed.It provides references and insights for interface research in other secondary battery systems.
lithium-metal batteriessolid electrolyte interphaseX-ray photoelectron spectroscopychemical state
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