Research On Preparation And Energy Storage Mechcnism Of Metal Foam Based (Ni,Fe) Anodes

At present,there is less research on aqueous energy storage negative electrode materials than positive electrode materials,and there is an urgent need to expand the types and research fields of high-performance negative electrode materials.In this work,S-doped high-performance Fe₂O₃ self-supporting multi-stage structure anode materials and new NiS/Ni₃S₂ anode materials were designed based on iron foam and nickel foam,respectively,and applied to aqueous alkaline rechargeable batteries.The Fe₂O₃ electrode capacity is increased by a factor of 10 by S modification.The negative electrode behavior mechanism of the new NiS/Ni₃S₂ electrode was successfully proposed by ex-situ XPS and XRD.Both S-Fe₂O₃ and NiS/Ni₃S₂ materials show excellent electrochemical performance as anode materials,and the assembled nickel/iron full battery and nickel/nickel full battery have practical application capabilities.This work is a breakthrough step in nickel-based anodes,and provides a new direction for the research of anode materials for advanced aqueous alkaline secondary batteries.（1）Using iron foam as the substrate,the self-supporting multi-stage structure of S-Fe₂O₃@Fe F was synthesized by one-step hydrothermal in-situ growth.The results show that the large specific surface area of the underlying nanosheet provides richer active sites and larger reaction contact area in the process of energy storage,and the irregular heterohedral structure on the surface ensures the stability of the material and enormous improves the electrochemical properties of the material.The S-Fe₂O₃@Fe F electrode has an extremely high area capacity(10.0 m Ah cm^-2)at 50 m A cm^-2.In the full-battery test,NiO@NF and S-Fe₂O₃@Fe F are used as positive and negative electrodes respectively,the power density can reach up to 23.29 W dm^-2,and the energy density can reach up to 0.942Wh dm^-2.Demonstrate the practical application value of integrated energy storage equipment in physical tests.（2）The Exploratory research of using nickel-based materials as alkaline energy storage anode was carried out for the first time,and NiS/Ni₃S₂@NF electrode materials were designed and successfully prepared,which expanded the types of alkaline energy storage anode materials and realized the breakthrough of using nickel-based materials as alkaline energy storage anode.The negative electrode behavior of NiS/Ni₃S₂@NF electrode was confirmed through electrochemical tests such as cyclic voltammetry,and it can have an area capacity of 1.2 m Ah cm^-2 at 5 m A cm^-2.Assembled NiS/Ni₃S₂@NF//NiO@NF nickel/nickel aqueous alkaline secondary batteries can provide a 1.5 V working potential window and have more stable rate performance than single electrodes.Successfully proved the practical application potential of nickel/nickel batteries as integrated energy storage devices in aqueous systems.