To investigate the role of the lithium cation we measured a 1M solution of sodium triflate (NaTfl, bright blue line, Figure ) between -10°C and 30°C. Since sodium cannot intercalate into LTO. The mean of the relaxation time distribution increased at least by 20 seconds, which again can only be explained if relaxation of Li ions in the bulk of LTO is affected. The maxima of the relaxation show a larger deviation around the trend line, which is caused by the logarithmic sampling of the relaxation times during measurement. Nevertheless, one can adjust the maximum bulk relaxation time T1 in those LTO nanoparticles within one order of magnitude using lithium or sodium containing electrolytes. In the electrolyte free lithium cations could be observed, which are probably caused by a partial exchange of Li with Na in LTO. Such an exchange could lead to a stronger shifting of polarons to the LTO surface. Since Na is restricted to the LTO surface only, initially bulk polarons, which enable the mobility of lithium cations in the bulk, now lead to a reduced influence on the bulk relaxation time T1. With lithium containing electrolytes lithium ions from the solution diffuse into the bulk material, acquiring polarons from the surface.