Fiber-shaped supercapacitors (FSCs) have attracted significant interest owing to their unique advantages of small size, light weight, high flexibility, and capability of being integrated into wearable electronics and smart textiles. Their main limitation, however, is their low energy density when compared with batteries. Here a fiber-shaped asymmetric supercapacitor (FASC) with high energy density has been developed successfully using CNT@ZnO-NWs@MnO₂ fibers as the positive electrode and CNT fibers as the negative electrode. Due to the high capacitances and excellent rate performances of CNT@ZnO-NWs@MnO₂ fibers and CNT fibers, such an asymmetric cell exhibits superior electrochemical performances. An optimized FASC can be cycled reversibly in the voltage range of 0–1.8 V, and exhibits a maximum energy density of 13.25 μW h cm⁻², which is much higher than those reported for fiber-shaped supercapacitors. Owing to the rational structure design, the all-solid-state FASCs demonstrate excellent mechanical and electrochemical stability. Over 1000 bending cycles, 96.7% of the initial capacitance can still be retained.

中文翻译：

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具有超高能量密度的纤维状不对称超级电容器，用于灵活/可穿戴的能量存储†

纤维状超级电容器（FSC）由于其体积小，重量轻，灵活性高以及能够集成到可穿戴电子产品和智能纺织品中的独特优势而引起了人们的极大兴趣。然而，它们的主要限制是与电池相比其能量密度低。在此，以CNT @ ZnO-NWs @ MnO ₂纤维为正极，以CNT @纤维为负极，成功开发了能量密度高的纤维状不对称超级电容器（FASC）。由于CNT @ ZnO-NWs @ MnO ₂的高电容和出色的倍率性能这样的不对称电池具有优异的电化学性能。优化的FASC可以在0-1.8 V的电压范围内可逆循环，并具有13.25μWh cm ^-2的最大能量密度，这比纤维状超级电容器的最高能量密度高得多。由于合理的结构设计，全固态FASC表现出出色的机械和电化学稳定性。在超过1000个弯曲周期后，仍可以保留96.7％的初始电容。