As a first step, the electrochemical lithium intercalation properties of bulk-and nano-TiS2 are evaluated to establish a baseline for the subsequent, in-depth analysis by electrochemical impedance spectroscopy (EIS). In cyclic voltammograms (CVs) recorded at a low sweep rate of 0.1 mV/s, two regions can be identified in both materials. A battery-like region with a pair of distinct redox peaks is observed above ca. 2.25 V, and a capacitor-like region with rectangular current profile is found below ca. 2.25 V (Fig. ). This is consistent with previous literature reports on lithium intercalation into TiS2 from carbonate-based electrolytes and was explained by the different intercalation-induced deformation behavior of TiS2 in the two regimes. The battery-like region is associated with volumetric expansion of the TiS2 host upon lithiation with diffusion-limited kinetics, while the capacitor-like region exhibits no volumetric changes and surface-limited kinetics. Previous studies reported these findings only for commercial bulk-TiS2. Our results of highly similar CVs for both materials suggest that the same intercalation mechanism is also present in ball-milled nano-TiS2. Galvanostatic charge/discharge profiles support this assumption by largely overlapping for both materials (Fig. ). The measured specific anodic/delithiation capacities at a rate of 100 mA/g are 192 and 215 mAh/g for bulk-and nano-TiS2, respectively, close to the theoretical capacity of 239 mAh/g for the reversible (de)intercalation of 1 Li + per TiS2. The kinetics of electrochemical intercalation reactions, specifically for high-power systems, are often analyzed using the so-called "b-value analysis", which aims to deconvolute kinetically diffusion-limited from surface-limited current contributions to the overall measured current. The method takes advantage of the scan rate dependence of redox peak currents according to equation (1) given above. The technique is employed for bulk-and nano-TiS2 for a series of cyclic voltammograms in a range of scan rates from 0.1 -10 mV/s (Fig. ). Extraction of the peak currents of cathodic (anodic) processes in both materials yields b-values of 0.76 (0.80) for bulk-TiS2 and 0.85 (0.86) for nano-TiS2 (Fig. ). When probing the lithiation of bulk-TiS2 from aqueous electrolyte, b-values of 0.66-0.67 are observed (Fig. ). A meaningful interpretation for the overall intercalation kinetics of such values between 0.5 and 1 is challenging, as they may point to finite-length diffusion effects (in contrast to semiinfinite diffusion, which should theoretically give b=0.5). This makes them highly sensitive toward particle size, i.e., diffusion lengths. Moreover, CVs recorded at faster scan rates show significant shifts of the redox potentials due to increasing overpotentials, ohmic contributions, and peak broadening, making the selection of individual "peak currents" more and more challenging and prone to mistakes. A more detailed description of the b-value analysis can be found in literature, also emphasizing the limitations of the method. To gain more meaningful insights into the kinetics of each individual step of the intercalation process, it is necessary to employ EIS analysis.