The morphology of the CNT networks was characterized by electron microscopy. Due to the Van der Waals forces, individual CNTs represent only a tiny portion (less than 5%) of the dispersion solution, as shown in the low-angle annular dark field scanning transmission electron microscopy (LAADF-STEM) image in Fig. . The individual CNT has a diameter of approximately 1.8 nm. In Fig. , the high-resolution transmission electron microscope (HR-TEM) image shows a CNT bundle with a diameter of 11 nm. When the CNT-dispersed solution was sprayed onto a substrate, numerous CNT bundles aggregated to form porous CNT networks, as shown in the scanning electron microscope (SEM) image in Fig. . Fig. illustrates the size distribution of the CNT bundles, exhibiting a predominantly Gaussian distribution, with over 50% of the bundle diameters falling within the 10-15 nm range. The pore size distribution of CNTs was further quantified by the non-local density functional theory (NLDFT) model from measured N 2 adsorption isotherm. As shown in Fig. , the CNTs have mesopores (mainly 10-50 nanometers) and micropores (1-2 nanometers), consistent with the electron microscopy results. The consistency of the CNT bundle and pore size distribution provides a network structure for efficient horizontal electrical transport through the CNT bundles and vertical ionic transport through the pores. Raman spectroscopy (Fig. ) also confirm the CNT molecular structure and its pristine, low-defect quality.