Fe-decorated-NiCo layered double hydroxide nanoflakes via corrosion engineering for high-energy rechargeable Zn-based batteries

The major obstacles of alkaline rechargeable Zn-based batteries are their low energy density and unsatisfactory durability, which are primarily caused by the low capacity and undesirable reversibility of Ni/Co-based cathodes. Meanwhile, the costly and tedious synthetic procedures also hinder their l...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-08, Vol.10 (34), p.17760-17765
Main Authors: Zeng, Jianning, Xie, Jinhao, Liu, Jie, Wang, Zilong, Cao, Xianshuo, Lu, Xihong
Format: Article
Language:English
Subjects:
Batteries
Cathodes
Cobalt
Corrosion
Decoration
Durability
Electrochemical analysis
Electrochemistry
Energy
Hydroxides
Hydroxyl ions
Intermetallic compounds
Iron
Rechargeable batteries
Substrates
Zinc
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Summary:The major obstacles of alkaline rechargeable Zn-based batteries are their low energy density and unsatisfactory durability, which are primarily caused by the low capacity and undesirable reversibility of Ni/Co-based cathodes. Meanwhile, the costly and tedious synthetic procedures also hinder their large-scale utilization. Herein, a reliable and cost-effective corrosion engineering approach is proposed to prepare highly active Fe-decorated-NiCo layered double hydroxide (FeNiCo LDH) nanoflakes on a Ni–Co foam (NCF) substrate for alkaline Zn-based batteries. As the Fe decoration can increase the number of active sites and enhance the surface adsorption of hydroxyl ions (OH − ), the FeNiCo LDH nanoflakes display a large areal capacity of 0.356 mA h cm −2 at 4 mA cm −2 and good reversibility, surpassing the electrochemical properties of the pristine NiCo LDH sample. When employed as a cathode, the as-fabricated alkaline Zn-based battery presents a considerable energy density of 2.84 mW h cm −3 and can be stably cycled over 5000 cycles. This work offers a low-cost and valid strategy to prepare high-capacity and reversible cathodes for alkaline Zn-based batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/D2TA04769A