Design,Construction And Electrochemical Performance Of Nickel-cobalt-manganese-based Supercapacitor Electrode Materials

Supercapacitors have great potential due to their fast charge and discharge rates,wide operating temperature range,and long-term stability.They can be used as a new type of excellent energy storage equipment to solve the energy crisis facing the world today.The electrochemical performance of supercapacitors mainly depends on the electrode materials.Among various types of supercapacitor electrode materials,transition metal-based compounds have become a promising electrode material because of their various oxidation states and high theoretical specific capacitance.Among them,nickel-cobalt-manganese-based supercapacitor electrode materials have excellent electrochemical performance,structural designability and abundant natural resources,but the nickel-cobalt-manganese-based supercapacitor electrode materials studied by more researchers at present have poor electron transport properties At the same time,the specific capacity of the electrode material prepared at the same time is much lower than the theoretical specific capacity.Therefore,in order to solve this problem,this paper combines a variety of nickel-cobalt-manganese-based compounds to prepare a new multi-element nickel-cobalt-manganese-based supercapacitor electrode material and designs the composition and structure of the new-type nickel-cobalt-manganese-based supercapacitor electrode material.Adjustment and construction,so that it can display a wealth of electrochemical reaction active sites and a stable structure in the process of carrying out an electrochemical reaction,thereby enabling the formation of supercapacitors with high specific capacity and energy density.In addition,the synthesis mechanism and electrochemical mechanism of the new nickel-cobalt-manganese-based supercapacitor electrode materials are also studied in depth,which provides a certain reference for improving the electrochemical performance of the nickel-cobalt-manganese-based supercapacitor electrode materials.The main research contents are as follows:（1）Co Fe₂O₄/Ni Fe₂O₄ nanocomposite was prepared by two-step hydrothermal method and the synthesis mechanism of this material was studied.In addition,the electrochemical performance of supercapacitors such as the specific capacity,rate performance and cycle stability of Co Fe₂O₄/Ni Fe₂O₄ electrode was explored.The effect of the layered heterostructure of the new Co Fe₂O₄/Ni Fe₂O₄ nanocomposite on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.（2）In order to simplify the preparation process of the material,a new three-dimensional layered heterostructure Mn Mo O₄/Ni WO₄ microsphere was prepared by one-step hydrothermal method and high temperature sintering and by adjusting the content of Ni WO₄.The structure formation mechanism of Mn Mo O₄/Ni WO₄ microspheres was studied.The electrochemical performance of supercapacitors such as specific capacity,rate performance and cycle stability of Mn Mo O₄/Ni WO₄ electrode was explored.The effect of the new three-dimensional layered heterostructure Mn Mo O₄/Ni WO₄ microspheres on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.（3）A new type of hydrangea-like Zn Co₂O₄/Ni₃V₂O₈ layered heterogeneous nanostructure composite material was prepared.The structure adjustment mechanism of Zn Co₂O₄/Ni₃V₂O₈ layered heterogeneous nanostructure composites was studied.The electrochemical performance of supercapacitors such as specific capacity,rate performance and cycle stability of Zn Co₂O₄/Ni₃V₂O₈ electrode was explored.The effect of the new hydrangea-like Zn Co₂O₄/Ni₃V₂O₈ layered heterogeneous nanostructure on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.In addition,the energy density and power density of the assembled Zn Co₂O₄/Ni₃V₂O₈//AC supercapacitor device were studied.（4）Flower-shaped and micro-mesoporous distribution Ni Co₂O₄/Ni O/Co₃O₄nanomaterials were prepared by using regulator and hydrothermal method.The micro-mesoporous distribution adjustment and structure construction mechanism of Ni Co₂O₄/Ni O/Co₃O₄ nanomaterials were studied.The electrochemical performances of supercapacitors such as specific capacity,rate performance and cycle stability of Ni Co₂O₄/Ni O/Co₃O₄ electrode were explored.The effect of the new three-dimensional layered heterostructure Ni Co₂O₄/Ni O/Co₃O₄ microspheres on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.In addition,the energy density and power density of the assembled Ni Co₂O₄/Ni O/Co₃O₄//AC supercapacitor devices were studied.（5）New carnation-like Mn₃O₄/Ni Co₂O₄/Ni O composite material was prepared by using the structure guiding agent and the method of controlling the hydrothermal reaction time.The structure adjustment mechanism of Mn₃O₄/Ni Co₂O₄/Ni O composite was studied.The electrochemical performance of supercapacitors such as specific capacity,rate performance and cycle stability of Mn₃O₄/Ni Co₂O₄/Ni O electrode was explored.The effect of the new carnation-like Mn₃O₄/Ni Co₂O₄/Ni O composite on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.In addition,the energy density and power density of the assembled Mn₃O₄/Ni Co₂O₄/Ni O//AC supercapacitor devices were studied.（6）Novel raspberry-like Ni/Ni O/Co O/Mn₃O₄ layered heterogeneous nanostructure composite material was constructed by adjusting the hydrothermal reaction time and introducing a reagent.The structure adjustment mechanism of Ni/Ni O/Co O/Mn₃O₄ layered heterogeneous nanostructure composites was studied.The electrochemical performances of supercapacitors such as specific capacity,rate performance and cycle stability of Ni/Ni O/Co O/Mn₃O₄ electrode were explored.The effect of raspberry-like Ni/Ni O/Co O/Mn₃O₄ layered heterogeneous nanostructures on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.In addition,the energy density and power density of the assembled Ni/Ni O/Co O/Mn₃O₄//AC supercapacitor devices were studied.（7）Combining Ni Fe₂O₄ with a stable and wide voltage range and Cu Co₂O₄/Cu O,new dendritic Cu Co₂O₄/Cu O/Ni Fe₂O₄ array was obtained and the structural adjustment mechanism of dendritic Cu Co₂O₄/Cu O/Ni Fe₂O₄ array was studied.The electrochemical performance of supercapacitors such as specific capacity,rate performance and cycle stability of Cu Co₂O₄/Cu O/Ni Fe₂O₄ electrode were explored.The influence of dendritic Cu Co₂O₄/Cu O/Ni Fe₂O₄ array on the electrochemical performance of supercapacitors was studied and the electrochemical reaction mechanism of this electrode material was explored.In addition,the energy density and power density of the assembled Cu Co₂O₄/Cu O/Ni Fe₂O₄//AC supercapacitor devices were studied.