Preparation and performance of nickel cobalt hydroxide cathode material for nickel zinc batteries
Nickel-cobalt hydroxide is widely adopted as an electrode material in nickel-zinc batteries owing to its high theoretical specific capacity,economic benefits,and abundant availability.Leveraging a coprecipitation method,this study modulates the concentrations of various nitrate solutions with different nickel-cobalt ratios,enabling the one-step room-temperature synthesis of nickel-cobalt bimetallic hydroxides.Notably,the synthesized samples are intended for use as positive electrode materials in nickel-zinc batteries.Microstructural characterizations of the synthesized samples are performed using several techniques,including X-ray diffraction,X-ray photoelectron spectroscopy,and scanning electron microscopy.Furthermore,the electrochemical performance of the samples as electrode materials for nickel-zinc batteries is assessed using an electrochemical workstation.The results reveal that using a high-concentration NaOH solution as the electrolyte results in higher capacities for nickel-zinc batteries compared to other nickel-cobalt hydroxides prepared via coprecipitation techniques.Notably,the optimal capacity is achieved at a nickel-cobalt feed ratio of 4∶1.Specifically,the Ni4Co1-LDH sample demonstrates the best performance,reaching a capacity of 327.9 mAh/g at a current density of 0.5 A/g.Consequently,a nickel-zinc battery is assembled using the Ni4Co1-LDH sample as its positive electrode material and zinc foil as its negative electrode material,with a high-concentration NaOH solution for electrochemical testing.Results reveal that the battery demonstrates a capacity of 230.7 mAh/g at a current density of 0.5 A/g.Overall,the proposed approach offers advantages of rapid material synthesis and excellent performance,thus offering new insights for the performance optimization of nickel-zinc batteries.
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