Thermodynamic and kinetic limits of Li-ion battery operation
[ 1 ] Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee
2022
scientific article
english
- Lithium-ion battery
- anode material
- cathode material
- batteries
- capacity
EN Capacity of graphene|electrolyte|Li laboratory cell was tested at different currents with the use of galvanostatic discharging. Impedance of Li4Ti5O12|electrolyte|Li laboratory and commercial Li-ion cells were measured with EIS method. Literature data describing Li-ion batteries such as cathode and anode material capacity, battery polarization, heat dissipation, volume changes, capacity under non-equilibrium conditions, pseudocapacitive behavior, and battery safety were discussed. All these factors, both thermodynamic and kinetic, determine overall practical battery efficiency. It was shown that different manners of electrode capacity expression are commonly used. The phenomenon of dependence of battery capacity on current was discussed. Practical capacity of electrode materials measured at non-equilibrium conditions (I > 0) are reported to depend on current. It was shown, that battery polarization shortens the time necessary to obtain the cutoff voltage. Therefore the measurement is stopped at a voltage before the system is fully discharged and hence, determined capacity value apparently decreases with current. Moreover battery efficiency is also limited by other necessary but electrochemically inactive parts of the device.
27.09.2022
105747-1 - 105747-8
Article number: 105747
CC BY (attribution alone)
open journal
final published version
at the time of publication
public
100
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