Research On The Preparation And Performance Of Self-oxidizing Nanoporous NiCoMn Flexible Supercapacitors

Compared with traditional physical energy storage equipment,supercapacitors have higher energy density,lighter weight and smaller size;compared with lithium ion batteries,supercapacitors have a simpler structure,faster charge and discharge speed,and power density Therefore,supercapacitors have received widespread attention at this stage.The nano-porous metal oxide composite electrode prepared by the de-alloying-auto-oxidation method has the advantages of high specific surface area,adjustable pore size,high active material load,and the like,and has wide application prospects in the field of pseudocapacitor supercapacitors.However,the dealloyed nanoporous metals have problems such as macro-embrittlement,which limits their batch preparation.In this dissertation,the macro preparation of nanoporous NiCoMn alloy-based electrode sheets is taken as the goal.The influence of the preparation process on the performance of plutonium capacitors is studied.The main research contents of this paper are:?1?A flexible nanoporous composite metal oxide electrode was prepared by the de-alloying-auto-oxidation method.Based on the research on factors such as free corrosion time,electrochemical polarization,annealing process,annealing temperature,and electrode thickness and spontaneous combustion,the conclusions were summarized.A process for preparing a flexible composite electrode with the best electrochemical performance:a 100?m three-layer composite metal plate is placed in a corrosive solution for 2 hours of free corrosion,and after being removed,it is washed with deionized water to prevent it from spontaneously igniting.Annealing was performed at an annealing temperature of 400°C in an Ar environment to obtain a flexible composite electrode.?2?An electrochemical test was performed on this flexible composite electrode.When the current density was 1 Acm^-3,the volume specific capacitance could reach960 Fcm^-3.After improving the preparation process,an electrochemical test was performed on the flexible composite electrode with a metal surface.When the current density was 1 Acm^-3,the volume specific capacitance was as high as 1255 Fcm^-3.?3?The supercapacitor device is fabricated by welding the nickel flexible tabs of the multilayer flexible composite electrode prepared above,the positive and negative electrodes are alternately covered with each other,and the water-based superelectric separator is used for blocking.Finally,the aluminum capacitor is placed in an aluminum plastic film and added with an electrolyte.The process is simple and the cost is low.As a result of the electrochemical test of the device,when the current density is 0.125 Acm^-3,the volume specific capacitance is 90.6 Fcm^-3,the energy density is 3.1 m Whcm^-3,and the power density is 2.5 m Wcm^-3.