4.7 Article

Rational construction of phosphate layer to optimize Cu-regulated Fe3O4 as anode material with promoted energy storage performance for rechargeable Ni-Fe batteries

Journal

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 108, Issue -, Pages 133-141

Publisher

JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.09.015

Keywords

Ni-Fe batteries; High voltage window regulation; High energy and power density; Anode materials; Amorphous phosphate layer

Funding

  1. National Natural Science Foundation of China [51802177]
  2. Independent Cultivation Program of Innovation Team of Ji'nan City [2019GXRC011]

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Flexible and secure aqueous energy storage devices are crucial for wearable energy storage. This study presents a Cu-doped Fe3O4 nanosheet with a 3D coral structure and a low-crystallization shell on the surface for enhanced ion transport. The newly developed CFPO electrode exhibits high capacity, and the assembled aqueous Ni-Fe batteries show high capacity and retention ratio. The aqueous quasi-solid-state batteries demonstrate remarkable energy density and power density.
Flexible aqueous energy storage devices with high security and flexibility are crucial for the progress of wearable energy storage. Particularly, aqueous rechargeable Ni-Fe batteries owning a large theoretical capacity, low cost and outstanding safety characteristics have emerged as a promising candidate for flexible aqueous energy storage devices. Herein, Cu-doped Fe3O4 (CFO) with 3D coral structure was prepared by doping Cu2+ based on Fe3O4 nanosheets (FO). Furthermore, the Fe-based anode material (CFPO) grown on carbon fibers was obtained by reconstructing the surface of CFO to form a low-crystallization shell which can enhance the ion transport. Excitingly, the newly developed CFPO electrode as an innovative anode material further exhibited a high capacity of 117.5 mAh g-1 (or 423 F g(-1)) at 1 A g(-1). Then, the assembled aqueous Ni-Fe batteries with a high cell-voltage output of 1.6 V deliver a high capacity of 49.02 mAh g(-1) at 1 A g(-1) and retention ratio of 96.8% for capacitance after 10 0 0 0 continuous cycles. What's more, the aqueous quasi-solid-state batteries present a remarkable maximal energy density of 45.6 Wh kg(-1) and a power density of 12 kW kg(-1). This work provides an innovative and feasible way and optimization idea for the design of high-performance Fe-based anodes, and may promote the development of a new generation of flexible aqueous Ni-Fe batteries. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

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