Abstract
Lithium ion capacitors (LICs) store electrical energy in the form of a double layer at the high surface area positive electrode such as activated carbon (AC) and in the form of lithium intercalation at the negative electrode through materials such as lithium titanium oxide (LTO). Due to unequal specific capacities and different physical properties of the electrodes, the mass ratio of electrodes (AC/LTO) has to be optimized for the improved performance of LICs at high currents. In this work, we use a physics-based model and compare the model predictions with the experimental data to show the effect of electrode mass ratio and highlight the influence of electrolyte salt depletion/precipitation effects at different currents. Our results show that lower mass ratio of the electrodes (AC/LTO) is better for high power performance of LICs.
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