Developing high performances aqueous rechargeable batteries is imperative and valuable. Herein, a novel aqueous rechargeable nickel//bismuth battery is developed based on highly porous Bi₂WO₆ and Co_0.5Ni_0.5MoO₄ microspheres as electrode active materials. Porous Bi₂WO₆ microspheres assembled from nanosheets as anode active materials can afford a specific capacity of 179.2 mAh·g⁻¹ at 1 A·g⁻¹, rate capability of 74.7% in 1–20 A·g⁻¹, and capacity retention of 57.2% for 1500 cycles at 15 A·g⁻¹. Owing to the highly porous microsphere with ‘ribbon’-like and intertwined nanolayers morphology, the screened Co_0.5Ni_0.5MoO₄ cathode active materials present an outstanding specific surface area of 293 m²·g⁻¹ and excellent electrochemical performance (such as superior specific capacity of 113.2 mAh·g⁻¹ at 1 A·g⁻¹, high rate performance of 51.8% in 1–15 A·g⁻¹, and good capacity retention of 48.5% for 4600 cycles at 15 A·g⁻¹). The corresponding aqueous rechargeable nickel//bismuth battery delivers the maximum energy density and power density of 35.8 Wh·kg⁻¹ and 3238.5 W·kg⁻¹, respectively. The present research would offer a worthwhile guidance for the effective construction of electrode active materials for aqueous rechargeable nickel//bismuth batteries.

Graphical abstract

中文翻译：

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基于高度多孔 Bi2WO6 和 Co0.5Ni0.5MoO4 微球的新型水系可充电镍//铋电池

开发高性能水系可充电电池势在必行且具有重要意义。在此，基于高度多孔的Bi ₂ WO ₆和Co _0.5 Ni _0.5 MoO ₄微球作为电极活性材料开发了一种新型水系可充电镍//铋电池。由纳米片组装而成的多孔Bi ₂ WO ₆微球作为负极活性材料在1 A·g ⁻¹下的比容量为179.2 mAh·g ^{−1 ，在1–20 A·g −1}下的倍率性能为74.7% ，容量为15 A·g 下 1500 个循环的保留率为 57.2% ^-1. 由于具有“带状”和相互缠绕的纳米层形态的高度多孔微球，筛选出的 Co _0.5 Ni _0.5 MoO _{4正极活性材料呈现出 293 m} ² ·g ^-1的出色比表面积和优异的电化学性能（如优异的1 A·g ⁻¹下的比容量为113.2 mAh·g ^{−1 ，1–15 A·g −1}下的高倍率性能为51.8%，15 A·g ⁻¹下4600次循环的良好容量保持率为48.5% ). 相应的水系可充电镍//铋电池的最大能量密度和功率密度分别为35.8 Wh·kg ⁻¹和3238.5 W·kg^-1，分别。本研究将为水系可充电镍//铋电池电极活性材料的有效构建提供有价值的指导。

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