What causes the polarization of Panasonic batteries?
Panasonic batteries will be polarized in the use of the phenomenon, so do you know what causes Panasonic batteries polarization phenomenon? The following details for you:
The polarization formed by the resistance of each part of Panasonic battery is called ohmic polarization.
Panasonic Battery Concentration Overpotential:
In the electrolysis process, because the active ions near the electrode surface react and precipitate on the electrode, the back electromotive force caused by the difference between the surface concentration and the solution phase concentration is called concentration superpotential.
Electrochemical overpotential of Panasonic battery
Because some active ions participating in the electrode reaction lack sufficient energy to complete the conversion of electricity, it is necessary to increase the electrode current, which is called activation superpotential. It is related to the activation energy of one of the slowest steps in the electrode reaction.
Panasonic battery resistance overpotential:
When current passes through the two poles, a thin layer of high resistance oxide film or other material film is formed on the surface of the electrode or the interface between the electrode and the solution, resulting in a surface resistance potential drop, which is called resistance superpotential. This situation is not universal, so we only discuss concentration polarization and electrochemical polarization.
The polarization of Panasonic batteries formed by the retardation of charge transfer process in the electrode-electrolyte interface layer is called activation polarization.
There are electrochemical polarization, ohmic polarization and concentration polarization. All three polarization phenomena are variable in dynamic state. Polarization of lead-acid batteries is caused by many reasons, but it can be solved by taking measures, such as electrochemical polarization is mainly water loss and heating; ohmic polarization is closely related to charging and discharging current; concentration polarization is related to temperature and different charging stages, but also to water loss. The reduction of electrolyte water ratio is bound to make concentration. Increased polarization. In addition, the electrolyte will deposit for a long time, the concentration below increases, the concentration above gradually decreases, the concentration differentiation between upper and lower, and concentration polarization also exists.
The concentration polarization of Panasonic batteries is called concentration polarization because of the slow mass transfer process in the electrode-electrolyte interface layer. The way to reduce polarization is to increase the reaction area of the electrode, reduce the current density, increase the reaction temperature and improve the catalytic activity of the surface of the electrode.
The difference of electrode potential before and after electrification is called overpotential difference. Balanced electrode potential is an electrode potential in a static and relatively idealized state without current flow. Battery polarization is the phenomenon that the actual electrode potential deviates from the equilibrium electrode potential after breaking the static state due to the current flow. The polarization of electrodes produced by anodic current is called anodic polarization; the polarization of electrodes produced by cathodic current is called cathodic polarization. The larger the current passing through the electrode per unit area, the more serious the potential deviation from the equilibrium electrode is. For example, iron rusts because there are impurities (usually C) in iron. In electrolyte solution, iron will be used as a negative electrode, while carbon as a positive electrode, accelerating the corrosion of iron.