The Synthesis Of Tin And Vanadium Oxide As Anode Material For Lithium Battery And Sodium Ion Batteries

Due to its long-cycle life,high specific energy,minor self-discharge and no memory effect,lithium ion ions?LIBs?has been attracted widespread attention.Currently,lithium-ion batteries have been commercialized,which are mainly used in mobile phones,automobiles and other electronic devices.However,due to the relatively low reserves and uneven distribution of lithium metal in nature,the commercialization cost of lithium ion batteries is high,which greatly limits the large-scale application of LIBs in large-scale electronic equipments.However,sodium metal and lithium metal are in the same main group,and sodium ion batteries?SIBs?have similar chemical properties to LIBs.More importantly,sodium metal is abundant in nature and low in price,which is attributed to the great research value.At present,the graphite materials are mainly applied to the commercial anode materials,but its application is greatly limited owing to its low theoretical specific capacity.Therefore,exploring negative electrode materials with higher specific capacity has become a research hotsopt.In this article,the high electrochemical performance of electrode material was synthesized by morphology and structural design.The main contents are as follows:?1?The SnO₂@Co_0.75Ni_0.75Sn_0.75@C?SnO₂@CoNiSn@C?was successfully synthesized via a solvothermal method followed by a high-temperature calcination.Notably,the in-situ formed CoNiSn nanoparticles embedded carbon layers construct a tough conductive matrix for fast electron transfer and effective buffering the volume variation.Benefiting from the intriguing structural and compositional features,this nanocomposite showed a high reversible capacity of 1231 mA h g^-1after 200 cycles at a current density of 0.2 A g^-1,and ultra-stable cycling performance with values of 436(at 10 A g^-1)and 195 mA h g^-1(at 20 A g^-1)after5,000 cycles.The intercalation mechanism of CoNiSn involved in SnO₂@CoNiSn@C was revealed by in-situ XRD,ex-situ XRD,and ex-situ TEM.?2?In our work,the flower-like structures VO₂?B?have been synthesized via a simple solvothermal method.The electrochemical properties have been investigated for lithium storage(with capacities of 529.2 mA h g^-1 at current density of 0.2 A g^-1after 200 cycles and 683.1 mA h g^-1 at 1 A g^-1 after 1000 cycles)and sodium storage(225.2 mA h g^-1 at 0.2 A g^-1 after 200 cycles,150 mA h g^-1 at 5 A g^-1).The reaction mechanism has been explored by ex-XRD and ex-TEM,which reveals the reaction mechanism for both LIBs and SIBs.