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By helically wrapping a wire shape axial electrode with another wire electrode, coaxial‐helix‐type ASCs with core–shell cable‐like structures have been creatively explored [86, 113–117]. For example, the Thomas group [117] fabricated a novel cable‐like coaxial‐helix‐type AFSC as illustrated in Figure 1.9a. The AFSC device was coaxially assembled using wire‐shaped electrodes, where the MnO₂@AuPd@CuO nanowiskers@copper wire core‐shell‐structured cathode was fabricated via a three‐step synthesis, and the Fe₂O₃@carbon fiber core‐shell‐structured anode was prepared through hydrothermal growing followed by conversion. The AFSC device could tolerate different bending states from 0^° to nearly 180° (Figure 1.9b), while its promising electrochemical performances such as quasi‐rectangular‐shaped CV curves, maximum output voltage of 1.8 V and volumetric capacitance of 1.6 F cm⁻³ did not sacrifice (Figure 1.9c). Furthermore, the AFSC device could serve as a bi‐functional integrated electrical cable for both electricity storage and electricity transmission.

Figure 1.9 (a) Schematics illustration shows the fabrication process of an anode and a cathode, respectively, and the structure of a coil‐type asymmetric supercapacitor electrical cable. (b) Optical images of a coil‐type asymmetric supercapacitor electrical cable at different bending states. (c) CV curves obtained at different bending states at 200 mV s⁻¹.

Source: Reproduced with permission [117]. © 2015, Wiley‐VCH.