Meaning
Chemical process maintains the integrity of the contact layer between an electrode and an electrolyte during cycling. Achieving interphase stabilization is necessary for preventing the continuous consumption of lithium and solvent. This stability is usually reached through the formation of a thin and uniform passivation film.
Additive Function
Sacrificial molecules are added to the electrolyte to decompose before the primary solvent. These additives drive interphase stabilization by forming a robust protective layer on the anode or cathode surface. Vinylenecarbonate is a common choice for creating a flexible film that can accommodate the volume changes of graphite.
Passivation Layer
Mechanical properties of the film determine its ability to withstand the stress of ion insertion. Effective interphase stabilization requires a layer that is electrically insulating but ionically conductive. If the layer is too thick, it increases the internal resistance of the battery.
If it is too thin, it may not provide a sufficient barrier against solvent oxidation.
Capacity Retention
Longevity of the cell improves when the interface remains static over hundreds of cycles. Successful interphase stabilization reduces the rate of capacity fade and prevents the growth of lithium dendrites. This process ensures consistent performance across various operating temperatures.
