Kurzfassung
Gegenstand dieser Studie ist ein kommerzieller Lithium-Ionen-Kondensator (LIC), welcher einer intensiven Alterung in Form von sukzessive durchgeführten Lade- und Entladeprozessen unterzogen wurde. Die dabei auftretenden dreidimensionalen Veränderungen der inneren Struktur wurden mittels Röntgen-Tomografie analysiert. Mit ansteigender Zyklenzahl finden wir eine Ansammlung von Elektrolytflüssigkeit im Bodenbereich des Kondensators vor. Unter Berücksichtigung der beim Zyklieren aufgezeichneten elektrischen Daten ergibt sich ein klarer Zusammenhang zwischen der Elektrolytverteilung im Bodenbereich und der Leistung des LIC.
Abstract
The correlation between the electrolyte distribution and the capacity of a commercial lithium-ion capacitor (LIC) during charge and discharge is investigated by non-destructive X-ray tomography. The 3D data reveal the accumulation of electrolyte at the bottom of the capacitor. While the accumulation of electrolyte at the bottom grows with increasing number of cycles, a marked decrease in capacity is observed. We attribute this effect to the loss of electrolyte within the active area of the LIC.
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