Study On The Preparation And Energy Storage Performance Of Nickel Oxide Ultrathin Nano Flower Flake For Flexible Electrode

With the advent of energy crisis and the increase of environmental problem,energy storage equipment based on the concept of super capacitor has attracted more and more attention because of its advantages of higher power density,faster charging capacity and longer life.As we all know,the key factor determining the electrochemical energy storage performance of supercapacitor is electrode material,so the development of new supercapacitor electrode material has become one of the current research hotspots.Among all kinds of transition metal oxide materials,NiO has the advantages of low price,easy synthesis,high theoretical specific capacity,non-toxic and environment-friendly.As one of the battery type capacitor materials,its development and research are of great significance.In this paper,based on a simple electrolysis technology,the nickel oxide electrode material with ultrathin nano flake morphology is prepared.The physical characteristics of the material,such as the crystal structure and morphology characteristics,are studied,and the activity of the material as the alkaline supercapacitor positive materialis characterized.Further,the electrochemical energy storage performances of NiO ultrathin nano flake under different preparation conditions are explored.The main contens of this paper are as follows:1.Firstly,the physical properties of NiO ultra-thin nanoflakes are characterized.The crystal structure of NiO is confirmed by XRD,and the electrochemical reaction based on electrolysis technology was deduced.Secondly,the detailed morphology of NiO is observed by TEM technology,which confirms that the NiO product is a cluster structure composed of a large number of ultrathin nano flake units,suggesting that the product has a high specific surface area;Moreover,through the SEM and EDS characterization of as-fabricated NiO flexible electrode,it is further confirmed that NiO material,as flexible electrode active material,shows high compatibility.2.The electrochemical performance of NiO flexible electrode is tested concerned its alkaline energy storage activity.The results show that as the current density is set as0.5A/g,the specific capacity is 165mAh/g.When the current density increases to 10A/g,the discharge specific capacity retains 89%of the initial value,indicating excellent rate capability.With a constant current density of 0.5A/g,the coulombic efficiency of NiO product is as high as above 90%after 10000 charge/discharge cycles,manifesting good stability.3.Single cell test is performed by using the as-synthesized NiO material and the commercial Fe₂O₃ as positive and negative electrode,respectively.The results show that as the current density is set as 0.5A/g,the specific capacity is 165mAh/g.When the current density increases to 10A/g,the discharge specific capacity retains 89%of the initial value,indicating excellent rate capability.With a constant current density of 0.5A/g,the coulombic efficiency of NiO product is as high as above 90%after 10000charge/discharge cycles,manifesting good stability.4.Furthermore,the effects of various preparation conditions on the activity of the materials were studied.The effects of electrolyte concentration,reaction temperature,time interval and precursor on the energy storage properties of the materials were studied.The results show that the electrolyte concentration,reaction temperature and time interval all affect the specific capacity and rate performance of NiO materials.By comparison,NiO materials with better properties under the optimal conditions are obtained.In addition,the electrochemical activity of the precursor materials was studied.