РФЕС і ЧП-МСВІ характеризація поверхні анода з алюмінієвої фольги після циклування у локалізованому висококонцентрованому Li+-електроліті

• Published in: Хімія, фізика та технологія поверхні
• Date: 2026
• Main Authors: Bi, Sihai, Kuksenko, S.P., Yang, Peixia
• Format: Article
• Published: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2026
• Subjects: рентгенівська фотоелектронна спектроскопія; часопролітна мас-спектрометрія вторинних іонів; локалізовані висококонцентровані органічні Li+-електроліти; алюмінієва фольга; анод; літієві та літій-іонні акумулятори
• Online Access: https://www.cpts.com.ua/index.php/cpts/article/view/897
• Journal Title: Chemistry, Physics and Technology of Surface

Traditional dilute LiPF6-organocarbonate electrolytes used in lithium-ion batteries (LIB) with graphite anode are unable to provide the safety, long service life, and power of the novel high-energy lithium batteries (LB), including those that initially have not lithium metal on the anode’s current collector. Improved properties are demonstrated by high concentration electrolytes (HCE), but the ultra-high salt concentration leads to low ionic conductivity and poor electrode wettability. This study shows for the first time the capability of localized high-concentration Li+-electrolyte (LHCE), such as 1.5 М LiN(SO2F)2 (LiFSI) solution in 1,2-dimethoxyethane (DME) diluted with    1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), dramatically increase the cycling of a cheap and high-energy aluminum foil anode (as an active material and current collector) to 1200 cycles with capacity loading       1 mАh cm–2 and current density 1 mА сm–2, with average Coulombic efficiency of cycles (CEav) equal to 99.2 %, even without prelithiation. Moreover, the Al anode in this electrolyte withstands cycling with 10 mА сm-2, and is also capable of operating at –20 °С without deterioration of electrochemical parameters. These achievements are made possible by the formation of a highly effective passivating layer with the function of a solid electrolyte (SEI) on the surface. For its characterization X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS) were used, which indicate inorganic nature of the nanometer-thick SEI enriched with LiF, Li3N, and Li2SO3. Not only does it rapidly transport ions, but it also functions as a strong self-healing shield, providing improved interfacial stability. Among other things, the study shows the possibilities and limitations of the applied analysis methods.