|Title||Infrared photothermal deflection spectroscopy: A new probe for the investigation of electrochemical interfaces|
|Publication Type||Journal Article|
|Year of Publication||1996|
|Authors||Zhongyi Deng, Jonathan D Spear, James D Rudnicki, Frank R McLarnon, Elton J Cairns|
|Journal||Journal of the Electrochemical Society|
|Keywords||electrochemical electrodes, electrolytes, foils, infrared spectroscopy, interface phenomena, lithium, photothermal spectroscopy, probes|
An infrared photothermal deflection spectroscopy system has been developed using infrared tunable diode lasers in the wavelength region from 8 to 16 μm. This system allows the collection of in situ optical absorption spectra of species at electrode/electrolyte interfaces in an electrochemical cell. The infrared spectra of LiOH and Li2CO3 formed on the surface of a lithium foil were recorded. The infrared photothermal deflection spectroscopy technique has been used to monitor the lithium electrode surface in an operating cell, Li/P(EO)8LiN(CF3SO2)2/Ni. The in situ spectra (in the 800-1000cm-1 region) show that the film formation at Li/polymer electrolyte interfaces is dominated by LiOH, although there also appears to be organic species in the surface film.