MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071, China.
Adv Mater. 2017 Nov;29(44). doi: 10.1002/adma.201702698. Epub 2017 Oct 9.
Currently, the main bottleneck for the widespread application of Ni-Zn batteries is their poor cycling stability as a result of the irreversibility of the Ni-based cathode and dendrite formation of the Zn anode during the charging-discharging processes. Herein, a highly rechargeable, flexible, fiber-shaped Ni-Zn battery with impressive electrochemical performance is rationally demonstrated by employing Ni-NiO heterostructured nanosheets as the cathode. Benefiting from the improved conductivity and enhanced electroactivity of the Ni-NiO heterojunction nanosheet cathode, the as-fabricated fiber-shaped Ni-NiO//Zn battery displays high capacity and admirable rate capability. More importantly, this Ni-NiO//Zn battery shows unprecedented cyclic durability both in aqueous (96.6% capacity retention after 10 000 cycles) and polymer (almost no capacity attenuation after 10 000 cycles at 22.2 A g ) electrolytes. Moreover, a peak energy density of 6.6 µWh cm , together with a remarkable power density of 20.2 mW cm , is achieved by the flexible quasi-solid-state fiber-shaped Ni-NiO//Zn battery, outperforming most reported fiber-shaped energy-storage devices. Such a novel concept of a fiber-shaped Ni-Zn battery with impressive stability will greatly enrich the flexible energy-storage technologies for future portable/wearable electronic applications.
目前，Ni-Zn 电池广泛应用的主要瓶颈是其循环稳定性差，这是由于在充放电过程中 Ni 基正极的不可逆性和 Zn 阳极的枝晶形成所致。在此，通过采用 Ni-NiO 异质结构纳米片作为正极，合理地展示了一种具有出色电化学性能的高可再充电、柔韧、纤维状 Ni-Zn 电池。得益于 Ni-NiO 异质结纳米片正极导电性的提高和电化学活性的增强，所制备的纤维状 Ni-NiO//Zn 电池具有高容量和令人钦佩的倍率性能。更重要的是，这种 Ni-NiO//Zn 电池在水性（10000 次循环后容量保持率为 96.6%）和聚合物（在 22.2 A g 下 10000 次循环后几乎没有容量衰减）电解质中表现出前所未有的循环耐久性。此外，柔性准固态纤维状 Ni-NiO//Zn 电池实现了 6.6 µWh cm 的峰值能量密度和 20.2 mW cm 的卓越功率密度，超过了大多数报道的纤维状储能器件。这种具有出色稳定性的新型纤维状 Ni-Zn 电池概念将极大地丰富未来便携式/可穿戴电子应用的柔性储能技术。
