Graphite Anode against Different Electrolytes

The impedance measurement is shown in Fig. 14.14. A comparable interface resistance is observed with graphite anode vs. Li, between ionic liquid and reference electrolyte EC/DEC-LiPFs at 80 However, EC/DEC-LiFSI based salt showed a lower interface impedance at 65 In the diffusimi part, the ionic liquids show higher resistance (20 and it increases in the order given in Eq. (14.5). Due to the high viscosity of the IL, the diffusion resistance is consequently higher. 

15 (a) The first discharge-charge cycles for U//graphite anodes in diffident electrolytes (b) the expanded version of the first cycle in the potential range 0.5-0 V 

In the LiFeP04 cells, the viscosity perhaps affects the performance also due to the carbon coating on the surface of LiFeP04 particles. When electrolyte has high viscosity like an ionic liquid, the wettability of the carbon layer is more difficult due to its large surface area. Then the lithium imi cannot migrate easily across this layer, particularly in the first cycles. Moreover, the viscosity can prohibit also the wettability of all the electrodes in depth, both anode and cathode because of the quasi 

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