Fiber-shaped energy storage devices featuring characteristics of macroscopic one-dimension, light weight, super-flexibility, and weavability demonstrate promising prospects for a category of crucial fields such as portable and wearable electronics. Particularly, fiber-shaped aqueous rechargeable (FAR) Ni//Bi batteries can further promote the development of wearable electronics due to their characteristics of low cost, flat discharge plateau, and no dendrite growth. However, it is currently challenging to simultaneously achieve high energy and power densities, and safety, which has seriously restricted their promising applications. Herein, a new type of FAR Ni//Bi battery with extraordinary electrochemical performance is created from hierarchical core-shell heterostructured electrodes, where bismuth trioxide (Bi₂O₃) nanosheets (NSs) directly grown on the surface of titanium nitride (TiN) nanowire arrays (NWAs) act as the anode while nickel hydroxide (Ni(OH)₂) NSs anchored on zinc doping cobalt-nickel-oxide (Zn-CoNiO₂) NWAs surface act as the cathode. Our as-assembled FAR Ni//Bi battery demonstrates ultrahigh energy density of 314.96 mWh cm⁻³ and remarkable power density of 20.04 W cm⁻³ with 88.6% capacity retention after 5000 cycles, which significantly outperform most state-of-the-art FAR batteries. This study offers a comprehensive and efficient strategy to develop high-performance aqueous rechargeable batteries by designing hierarchical core-shell heterostructured electrodes.

具有宏观一维、重量轻、超柔韧性和可编织性等特点的纤维状储能器件在便携式和可穿戴电子产品等关键领域展现出广阔的前景。特别是纤维状水基可充电（FAR）Ni//Bi电池由于其成本低、放电平台平坦、无枝晶生长等特点，可以进一步促进可穿戴电子产品的发展。然而，目前同时实现高能量和功率密度以及安全性具有挑战性，这严重限制了它们的有前途的应用。在这里，一种具有非凡电化学性能的新型 FAR Ni//Bi 电池由分级核壳异质结构电极制成，其中三氧化二铋 (Bi ₂O ₃ ) 纳米片 (NSs) 直接生长在氮化钛 (TiN) 纳米线阵列 (NWA) 的表面上充当阳极，而氢氧化镍 (Ni(OH) ₂ ) NSs 锚定在锌掺杂的钴镍氧化物 (Zn- CoNiO ₂ ) NWAs 表面充当阴极。我们组装好的 FAR Ni//Bi 电池表现出 314.96 mWh cm ^{-3 的}超高能量密度和 20.04 W cm ^{-3 的}卓越功率密度，5000 次循环后容量保持率为 88.6%，明显优于大多数最先进的电池远电池。该研究为通过设计分层核壳异质结构电极开发高性能水性可充电电池提供了一种全面有效的策略。