Synthesis And Properties Of Nickel Metal Compounds With Complex Structures

With the rapid development of the new era,people’s demand and attention to electronic energy storage equipment is gradually increasing.Among many battery systems,the water Zinc ion battery with nickel metal compound material as the positive electrode stands out.It has the advantages of high voltage,stability in water and electrolyte,low equilibrium potential,large power density,little environmental hazard,good safety,large reserves,low preparation cost and high repeatability.However,nickel-based materials also have some problems to be solved,such as unsatisfactory conductivity,capacity and cycle life stability.Therefore,in order to promote the development of high-performance battery energy storage system research process,the focus is to study better performance of electrode materials.In view of this problem,the synthesis conditions of nickel-based electrode materials were explored and the morphology and structure were designed to shorten the ion transfer path by improving the contact area between the material and the electrolyte.According to the physical characterization and chemical properties test,the research results are as follows:First of all,this article take the chemical precipitation method and hydrothermal method,two kinds of synthesis methods of preparation of Ni（OH）₂ powder materials,samples of different proportion of synthetic test comparison,by comparison to get the optimal synthetic conditions and the characteristics of morphology after tests found that the flower ball sample performance higher than that of block sample,this is due to the spherical morphology to electrolyte contact.In order to further solve the problem of electrical conductivity of nickel-based materials,this paper continues to optimize Ni（OH）₂ material,which is loaded on the carbon cloth matrix to obtain an independent electrode,so as to increase the electrical conductivity of the material.The optimum synthesis conditions and morphology were obtained through comparative tests of different hydrothermal time and different hydrothermal temperature.Moreover,the Ni（OH）₂ independent electrode was further optimized and doped to find out the best doping amount of cobalt.Flexible Zinc-nickel battery was prepared with zinc plate and hydrogel electrolyte,and the test showed good stability of charge and discharge cycle.Secondly,this paper optimizes the problems of low conductivity and unsatisfactory capacity and cycling stability of Ni₃S₂ material.Ni₃S₂powder material was synthesized by hydrothermal method,and the optimal synthesis conditions were compared by testing different proportions.It was found that the charge-discharge cycle was stable,but its capacity was low.In order to improve the capacity and conductivity of the material at the same time,the Ni₃S₂ material was loaded on the nickel foam to obtain an independent electrode,and the optimal synthesis conditions and morphology were also compared through tests of different proportions.After testing,it was found that the performance was improved,but the capacity still needs to be improved.Therefore,in order to continue to optimize the synthesis conditions of the morphology and structure of nickel metal sulfide Ni₃S₂material and improve the electrochemical performance,a new type of Ni₃S₂@SNCNT hollow fiber with structural morphology was synthesized by coaxial electrostatic spinning,vulcanization and calcination.Its by the S/N of doped carbon nanotubes,ultrafine nickel sulfide nanoparticles and hierarchical hollow structure,the structure to achieve the high porosity and high electrical conductivity,the material tested showed high energy and power density,and good durability and electrochemical performance improved significantly for a long time,this is because the topography is advantageous to the fast electron,ion transport.Therefore,this work makes Zinc-nickel batteries show great research prospects in energy storage systems.