I don't know the details, in general, the anode (Graphite electrode) potential is higher than the dissolution potential of the Cu foil (anode current collector) at immediately filling the electrolyte in the cell. In order to suppress the dissolution of Cu, it is necessary to charge a little with a small current to lower the potential. This process is sometimes called to as pre-charging. Since the electrolyte is not sufficiently soaked into the electrodes and separator, you must pay attention to the current value. If pre-charged under appropriate conditions, the cell voltage will be near OCV, so you will obtain enough time to soak the electrolyte without dissolution of the Cu foil.
Commercial-grade electrodes are not very porous. To let the electrolyte seep into the pores for good ionic conductivity, the cells are rested before cycling.
In general, the amount of rest a cell has before the charge-discharge test depends on several modes. Ignoring the surface area of the electrode, the amount of electrode wettability in terms of density and coating porosity should be examined. Whenever the amount of porosity and density of the coating is, it needs less rest time.
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