The use of polarized light in the infrared reflectance spectroscopic investigation of the lithium-organic electrolyte interface

• Published in: Journal of power sources Vol. 54; no. 2; pp. 296 - 300
• Main Authors: Barusseau, S., Beden, B., Broussely, M., Perton, F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 1995; Elsevier Sequoia
• Subjects: Chemistry; Electrochemistry; Exact sciences and technology; General and physical chemistry; Infrared reflectance spectroscopy; Lithium electrodes; Miscellaneous; Organic electrolytes; Study of interfaces; Infrared reflectance spectroscopy; Lithium electrodes; Organic electrolytes; Electrodes; Infrared spectrometry; Organic solvent; Fourier transformation; Lithium Hexafluoarsenates; In situ; Electrode electrolyte interface; Lithium; Alkali metal; Experimental study; Polarized light
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/0378-7753(94)02087-J

Surface films formed on lithium were investigated using in situ reflectance infrared spectroscopy. Experiments were carried out using sophisticated techniques like EMIRS (electro-modulated infrared reflectance spectroscopy) or SNIFTIRS (subtractively normalized interfacial Fourier-transform infrared spectroscopy). Spectra were recorded with both p- and s-polarized light to distinguish the surface species belonging to the passive layer from those in solution. The solutions used included LiAsF 6 in mixtures of propylene carbonate, ethylene carbonate and dimethoxyethane (1:1:3). The main components detected at the surface films were lithium alkyl carbonates (ROCO 2Li) and lithium carbonate (Li 2CO 3), this in agreement with previous work by Aurbach and co-workers. Besides, spectra reveal the presence of other types of species whose nature has been discussed.