Chemically Coupled Fe2O3/Graphene Hydrogel as Binder‐Free Anode Material for Stable Ni‐Fe Battery with High Energy and Power Density. Issue 2 (24th November 2021)

• Record Type: Journal Article
• Authors: Yin, Fuqiang; Yang, Pingping; Chen, Xiaoying; Yang, Qing; Xie, Jiale
• Is Part Of: Batteries & supercaps. Volume 5:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-24
• Subjects: aqueous Ni−Fe batteries -- binder-free -- Fe2O3 -- graphene hydrogel -- rechargeable; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202100289
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Aqueous nickel‐iron (Ni−Fe) batteries provide a sustainable solution for large‐scale power sources, but their practical applications are still restrained by the nonstable Fe anodes. A simple, inexpensive and mass‐manufacturable one‐pot strategy is used to in situ grow Fe2 O3 nanoparticles on graphene sheets for preparing a chemically coupled Fe2 O3 /graphene hydrogel (Fe2 O3 @GH), of which the pore structure can be well rationally tuned by the ratio of graphene to Fe2 O3 . In contrast to the conventional iron oxide/carbon anodes (FeO x /C), Fe2 O3 @GH anode in Ni−Fe batteries delivers much higher specific capacity (287.2 mAh g −1 vs. 159.5 mAh g −1 at 2 A g −1 ), better stability (capacity retention of 95 % vs. 61.2 % after 1000 charge/discharge cycles) and superior power density comparable with supercapacitors. More remarkably, the assembled full rechargeable Ni−Fe battery made from Ni(OH)2 microspheres growing on Ni foam (Ni(OH)2 MSs@NF) (+)//Fe2 O3 @GH (−) achieves excellent cycling stability (retention of 82 % of specific capacity after 500 cycles) at a large operating potential of 1.6 V, while delivering the largest energy density of 203 Wh kg −1 and also a highest power density of 6.4 kW kg −1 among the reported full Ni−Fe batteries. This work holds great promises to fabricate alternative safer high‐performance vehicle batteries. Abstract : Anode materials for Ni‐Fe aqueous battery : Chemically coupled Fe2 O3 nanoparticles/graphene hydrogel synthesized by one‐pot aqueous hydrothermal method delivers a higher specific capacity of 287.2 mAh g −1, a superior capacity retention of 95 % after 1000 cycles and superior power density comparable with supercapacitors.