Synthesis And Electrochemical Performances Of Oxide/graphene Composite Anode Materials

In recent years,researchers have made a lot of research results on new energy lithium/sodium ion battery cathode materials.At present,we have turned our attention to the anode materials of lithium/sodium ion batteries that have potential and can be widely used.When lithium-ion batteries first emerged,lithium metal was used as the anode material.During the use of the battery,metal lithium easily forms lithium dendrites during the charging and discharging process of the lithium battery,causing uneven current density distribution and promoting the growth of lithium dendrites,leading to short circuits and even explosions in the battery,causing significant losses.Therefore,lithium metal can no longer be used as a negative electrode material for commercial lithium batteries.Researchers found that layered graphite does not produce lithium dendrites during the electrode reaction process,which is highly safe.But its theoretical specific capacity is only 372 m Ah g^-1,which cannot meet the market’s demand for lithium batteries.Manganese oxide has the characteristics of low cost,ideal electrochemical behavior and environmental friendliness,and has attracted the attention of scholars.Among them,Mn O₂has the most stable structure,ideal physical and chemical properties,and its theoretical specific capacity is 1230 m Ah g^-1.The most ideal negative electrode material used in lithium ion batteries.In this paper,a spherical Mn O₂material was prepared by the co-precipitation method,and then graphene oxide（GO）was used as the matrix carbon material to synthesize Mn O₂/r GO composite material by hydrothermal method.Then the electrochemical performance test and analysis of Mn O₂material and its composite material as lithium battery anode material are carried out.It can be seen from the test results that compared with the spherical Mn O₂,the Mn O₂/r GO composite material is found to have better electrochemical performance after testing.After 20cycles of charging and discharging cycles on the blue electric device,its specific discharge capacity is observed It remains at 451.4 m Ah g^-1.Among the anode materials suitable for sodium ion batteries,antimony oxide anode materials have attracted much attention because of their high theoretical specific capacity(660 m Ah g^-1)and excellent sodium storage performance.In this paper,Sb₂O₃/r GO composite was synthesized by adding hydrazine hydrate in one step at room temperature.During the synthesis process,GO was reduced by hydrazine hydrate while preventing Sb³⁺from being oxidized to Sb⁵⁺.In addition,the addition of hydrazine hydrate effectively suppressed the agglomeration of Sb₂O₃.From the test results of electrochemical performance,it can be seen that the Sb₂O₃/r GO composite shows good rate performance and cycle performance,which we believe is due to the good electrical conductivity of r GO and the strong chemical bond between r GO and Sb₂O₃.The introduction of reduced graphene oxide（r GO）is a method that can effectively improve the electrochemical performance of Sb₂O₃.This paper selects graphene oxide and oxides to compound,prepares A_xO_y/GO composite materials for lithium battery and sodium battery anode materials,combined with graphene excellent mechanical properties,high conductivity,and high oxide capacity Advantages,an oxide/reduced graphene oxide composite material with excellent comprehensive performance is prepared,and the synthesis method used is simple,and it is expected to realize industrial production...