A porous carbon nanotube(CNT) network was deposited on the surface of carbon nanotube fibers(CNF) by low-potential electrophoretic deposition, and then a layer of polyaniline(PANI) was electrochemically deposited on the surface of the CNT-decorated carbon nanotube fiber to form a core-sheathed structure of three-dimensional porous CNF/CNT/PANI fiber electrode material. Scanning electron microscopy(SEM), transmission electron microscopy(TEM) and Raman spectroscopy were used to characterize the morphology and...