Preparation Technology And Electrochemical Performance Of Nickel-cobalt-manganese Sulfide Composite Electrod

Supercapacitors are so far very promising energy storage devices,however,due to their low energy density,they are not commercially available on a large scale.And in the supercapacitor,the performance of the electrode can directly affect the overall performance of the supercapacitor,which has a more important impact.Therefore,in this paper,the transition metal（Ni,Co,Mn）sulfide battery electrode material was designed and synthesized by hydrothermal method,taking the transition metal（Ni,Co,Mn）sulfide as the research object,and the electrode showed excellent mass ratio capacitance.Therefore,the relationship between electrode preparation technology and electrochemical performance is discussed in detail in this paper.Taking the electrochemical performance of the electrode as the index,the optimum preparation process of the electrode material was experimentally studied,and the physical characteristics of the electrode material prepared under the optimal process such as phase composition,element distribution,surface structure and valence state were tested.The main research contents and achievements of this paper are as follows:Firstly,the optimal preparation conditions for growing single transition metal sulfides on nickel foam matrix were studied.Single transition metal sulfides were prepared under optimal reaction conditions,and the best performance of the three transition metal sulfides under the optimal process technology was obtained.Secondly,the optimal preparation conditions for growing transition metal（Ni,Co,Mn）sulfides on nickel foam matrix were studied.The effects of manganese chloride concentration,cobalt chloride concentration,nickel chloride concentration,hydrothermal temperature,hydrothermal time and thiourea concentration on the electrochemical properties of transition metal（Ni,Co,Mn）sulfide electrode materials were adjusted during the hydrothermal reaction.And the transition metal（Ni,Co,Mn）sulfide physical characterization,under this process,the prepared electrode material exhibited a mass specific capacitance of 2805.3 F g^-1 at a current density of 1 A g^-1,and under a high current density of 10 A g^-1,after 10000 cycles,the capacitance retention rate can reach 82.9%of the initial value,and the excellent electrochemical performance is attributed to the synergistic effect between the components in this electrode material,and the large specific surface area of sulfide.And no other adhesives are introduced during the electrode preparation.Finally,the prepared transition metal（Ni,Co,Mn）sulfide electrode and commercial activated carbon electrode were assembled to assemble the asymmetric supercapacitor of this paper,and the energy storage device exhibited an energy density of about 86.9 k Wh kg^-1 at a high power density of 799.1 W kg^-1,indicating that this electrode is a supercapacitor electrode with great research and utilization value.