October 2013In the research group of Professor Janek an infrared spectrometer and thus a new characterization method for battery materials has been established recently. Due to its small size the new device could be installed in a glove box under a protective gas atmosphere which allows the analysis of active materials of cycled batteries without contact to air or humidity. Usually, all samples are measured using the technique of attenuated total reflection. The infrared radiation penetrates a few micrometers into the sample, excites molecular vibration and is attenuated thereby. This wavelength-dependent attenuation is registered at the detector and converted into a spectrum. As an example, spectra of typical battery electrolytes are shown in the figure. While propylene carbonate significantly differs from the three ethers, these show at first glance, not much difference. By using a database, it is possible to distinguish and identify even these three. In the background of the spectra, you can see the device with sample-stage and fixation for solid samples. (Picture submitted by Conrad L. Bender.)https://www.uni-giessen.de/en/faculties/f08/departments/physchem/janek/gallerypotm/pom2013/october-2013/viewhttps://www.uni-giessen.de/@@site-logo/logo.png
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October 2013
In the research group of Professor Janek an infrared spectrometer and thus a new characterization method for battery materials has been established recently. Due to its small size the new device could be installed in a glove box under a protective gas atmosphere which allows the analysis of active materials of cycled batteries without contact to air or humidity. Usually, all samples are measured using the technique of attenuated total reflection. The infrared radiation penetrates a few micrometers into the sample, excites molecular vibration and is attenuated thereby. This wavelength-dependent attenuation is registered at the detector and converted into a spectrum. As an example, spectra of typical battery electrolytes are shown in the figure. While propylene carbonate significantly differs from the three ethers, these show at first glance, not much difference. By using a database, it is possible to distinguish and identify even these three. In the background of the spectra, you can see the device with sample-stage and fixation for solid samples. (Picture submitted by Conrad L. Bender.)
