I was plotted my EIS data and I got that my Rs and Rb value at 10th cycle lower than at OCV, is that possible? Actually I find some reference that the resistance of electrolyte (Rs) can decrease due to the decreasing viscosity of electrolyte during cycling processes. is that same case with the resistance for Li/Na diffusion in the surface layer (Rb) ?
https://doi.org/10.1007/s11664-018-6826-0
Regarding increase/decrease of electrolyte resistance, it depends on the electrolyte system being used and the chemistry involved in electrochemical reaction. Like in Lithium Sulfur chemistry, sulfur converts into polysulfides which subsequently dissolve into electrolyte altering its resistance. Secondly, you have to look whether change in resistance is small or big. Minimal changes are difficult to interpret while significant changes can be explained by understating the chemistry of the system. So YES
Regarding diffusion resistance, its common to observe that after multiple lithiation the electrode becomes porous making it easy for lithium to diffuse. Moreover, if micro-size particles are used for electrode preparation, they can break down into smaller particles after multiple lithiation/delithiation, causing diffusion resistance to decrease. So YES
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