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Fiber AFSCs with stand‐alone two‐ply‐yarn type configuration has been proposed for efficient weaving into textiles, which are constructed by coating two fiber electrodes with polymer electrolyte and then twisting them together without outer packaging [118–120]. As shown in Figure 1.10a, Jin et al. [118] recently employed carbon‐fiber‐thread@polyaniline as cathode and functionalized carbon‐fiber thread as anode to fabricate a two‐ply‐yarn‐type AFSC device with PVA‐H₃PO₄ gel electrolyte. The device successfully reached a high operating voltage of 1.6 V with energy density up to 2 mW h cm⁻³. In order to demonstrate its potential in practical applications, the device was woven into a glove (Figure 1.10b) and exhibited excellent mechanical tolerance against bending (Figure 1.10c). The flexibility of the device was also examined via stretching to even 100% (Figure 1.10d), while the capacitance of the stretched device merely changed (Figure 1.10e).