High-mass-loading NiCo-LDH hollow nanoflower for high-performance alkaline aqueous zinc batteries

Huihe Gao , Na Li , Chuanlin Li , Xixi Zhang , Wenjie Liu , Jing Sun , Qingxiu Yu , Jiawei Zhu , Chenggang Wang , Xijin Xu
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Abstract

Nickel/cobalt-based materials are promising cathodes owing to the high redox potential, high specific capacity, and long cycling performance. However, with the mass-loading of the electrode increasing, it greatly hinders the ion diffusion and charge transport, resulting in serious decrease of the electrode capacity. Herein, a hierarchical nickel-cobalt-based porous nanoflower structure (NiCo-Nanoflower) composed of numerous ultrathin nanosheets is synthesized, which significantly enhances the surface area and provides additional active sites. Besides, the abundant oxygen defects in NiCo-Nanoflower significantly enhance its electrical conductivity. Therefore, the NiCo-Nanoflower electrode exhibits a high reversible capacity of up to 210.4 mAh g−1 at 0.5 A g−1 and excellent rate retention of 180.4 mAh g−1 at 8 A g−1 (104 mA cm−2) even under high areal mass loading of 13 mg cm−2. Upon assembly in a NiCo//Zn battery system, the configuration demonstrates exceptional electrochemical stability, maintaining 74.3% capacity retention after 5000 cycles. This work demonstrates that NiCo-Nanoflower, equipped with three-dimensional microstructure and oxygen-enriched defects, holds significant potential for application in high-mass-loading cathodes for alkaline aqueous zinc batteries.

Abstract Image

高性能碱性水锌电池用高质量负载NiCo-LDH空心纳米花
镍钴基材料具有高氧化还原电位、高比容量和长循环性能等优点,是一种很有前途的阴极材料。然而,随着电极质量负荷的增加,极大地阻碍了离子扩散和电荷输运,导致电极容量严重下降。本文合成了由多个超薄纳米片组成的分层镍钴基多孔纳米花结构(nico - nanflower),该结构显著提高了表面面积并提供了额外的活性位点。此外,镍纳米花中丰富的氧缺陷显著提高了其导电性。因此,NiCo-Nanoflower电极在0.5 a g−1时具有高达210.4 mAh g−1的高可逆容量,在8 a g−1 (104 mA cm−2)时具有180.4 mAh g−1的优异保留率,即使在高面积质量负载为13 mg cm−2时也是如此。在NiCo/ Zn电池系统中组装后,该结构表现出优异的电化学稳定性,在5000次循环后保持74.3%的容量保留率。该研究表明,具有三维微观结构和富氧缺陷的NiCo-Nanoflower在碱性锌水电池高质量负极材料中具有重要的应用潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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