Cyclic voltammograms at a sweep rate of 0.1 mV s -1 (Fig. ) give additional insights into the (de)lithiation process. The shift to a lower lithiation (reduction) potential for PA-and HDApillared materials is clearly visible. The position of the delithiation (oxidation) peak for the three materials is different, showing a variation of the overpotential of the (de)lithiation reaction. HTO-PA shows the lowest overpotential (ca. 150 mV) compared to HTO-HDA (ca. 280 mV) and HTO (ca. 220 mV), indicating the highest electrochemical reversibility for HTO-PA. Additionally, there is an identical very low intensity set of redox peaks visible around 1.75 -1.8 V for all samples. These can be attributed to (de)lithiation of anatase TiO2 impurity, indicative of minor secondary phases across all three titanate samples potentially resulting from trace amounts of TiO2 precursor from the solid-state synthesis of K2Ti4O9. Since it is equally present in each sample, its influence on the overall comparability between the samples is negligible.