Study On Ternary Metal Hydroxide Materials As Supercapacitor Electrode Materials

Energy has always been a key factor affecting social development.Even now,there are still problems in the global energy structure,which is a major hidden danger of a series of problems such as the energy crisis.Researchers are developing new energy conversion and storage devices to solve the problems.Among them,supercapacitor is a new type of energy storage device,which has the advantages of fast charge and discharge,high energy density and long service life that traditional energy storage equipment cannot match.Transition metal hydroxides have very high application potential as electrode materials for supercapacitor due to their high theoretical specific capacity and ease of preparation.However,such materials still have problems with low cycle life and low conductivity.Therefore,we study from three perspectives:synthesize a ternary metal hydroxide material,which can produce a synergistic effct between different metal ions;Adjust the ratio of different metal ions;composite ternary metal hydro.xide with carbon material to improve the electrochemical performance of the electrode material.The main research of the paper are as follows:NiCoMo-OH ternary metal hydroxide material is prepared by a one-step hydrothermal method.Compared with single-phase Ni(OH)2 material,NiCoMo-OH has a unique three-dimensional spherical nanostructure composed of nanosheets.Electrochemical test results show that NiCoMo-OH has a higher specific capacity and good cycle performance.A flower-like NiCoMn(OH)6 ternary metal hydroxide material is prepared,and the optimal Mn ion introduction ratio is explored by adjusting the amount of Mn ions introduced during preparation.The test results show that when Ni:Co:Mn is 1:1:1,the electrode material has the best overall electrochemical performance.NiCoMn(OH)6 is combined with carbon nanotubes(CNTs)to prepare NiCoMn(OH)6/CNTs composites,and the optimal amount of carbon nanotubes is studied.When the doping amount of CNTs is 3 wt%,the material has the best electrochemical performance,with a specific capacity of 2136.2 F g-1 at 1 A g-1 and a capacity retention rate of 76.9%after 2000 cycles.The assembly of asymmetric supercapacitors(ASC)also proved its potential for application as electrode materials for supercapacitors.