Cycling and fatigue induced swelling of electrodes in 18650-type lithium-ion batteries

The experiment will show the differences of electrode swelling in commercial lithium-ion batteries. The swelling of the electrode material is connected to the solid electrolyte interphase growth, which is a result of side reactions, which occur during the cell operation. Therefore, measuring the swelling of the electrodes enables the indentification of areas with higher and lower side reaction density, which will help to further improve state-of-the-art lithium-ion batteries. Measuring of two idientical cells in fresh and aged state will add further information how cell-to-cell variations influence this side reactions. In total, this experiment will be one of the first approaches creating a kind of “side reaction density” map in commercial lithium-ion batteries.