Flexible yarn-shaped batteries are promising candidates for the wearable electronics owing to their good flexibility, tiny volume, compatibility with textiles. However, their practical applications are hindered by low capacity, active material mass loading, and energy density. Herein, we develop a coaxially wrapping strategy to fabricate an advanced yarn-shaped aqueous zinc-ion batteries (AZIBs) incorporating core-sheath carbon nanotube (CNT)/VO·nHO composite yarns as cathodes and zinc wire as anodes. The as-wrapped CNT intermediate layer not only enhances the surface's conductivity, but the nano-array porous layer can also accelerate the mixing of ion concentration between the electrode surface and the electrolyte fluid through the turbulence effect, thereby improving the interfacial ion/electron kinetics. As a result, the energy storage mechanism of CNT/VO·nHO yarn AZIBs transformed from capacitive-dominant to diffusion-controlled process, and the batteries demonstrate exceptional discharge capacity of 566.7 mAh g at 0.1 A g, surpassing the state-of-art yarn-based AZIBs and approaching the theoretical zinc storage capacity (589 mAh g). In addition, they exhibit a high energy density of 471 Wh kg at 25.5 W kg and excellent cycling performance. This work opens a new and efficient avenue for the structure design of high-performance electrode materials for flexible yarn-based batteries.

中文翻译：

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通过碳纳米管中间层集成提高纱线状锌-V2O5·nH2O电池的界面反应动力学


柔性纱线状电池因其良好的柔韧性、体积小、与纺织品的兼容性而成为可穿戴电子产品的有希望的候选者。然而，它们的实际应用受到低容量、活性材料质量负载和能量密度的阻碍。在此，我们开发了一种同轴缠绕策略来制造先进的纱线状水性锌离子电池（AZIB），该电池采用核鞘碳纳米管（CNT）/VO·nHO复合纱线作为阴极，锌丝作为阳极。包裹的CNT中间层不仅增强了表面的导电性，纳米阵列多孔层还可以通过湍流效应加速电极表面与电解液之间离子浓度的混合，从而改善界面离子/电子动力学。结果，CNT/VO·nHO纱线AZIBs的储能机制从电容主导过程转变为扩散控制过程，电池在0.1 A g时表现出566.7 mAh g的优异放电容量，超越了现有技术基于纱线的 AZIB 并接近理论锌存储容量（589 mAh g）。此外，它们在 25.5 W kg 时具有 471 Wh kg 的高能量密度和出色的循环性能。这项工作为柔性纱线电池的高性能电极材料的结构设计开辟了一条新的、有效的途径。