Experimental Study On Ternary Cathode Material And Solid Electrolyte Of Magnesium Ion Battery

In modern society,rechargeable lithium-ion batteries?LIB?have always occupied the market of the secondary battery industry and are the main energy source for portable electronic devices.Because the elements magnesium and lithium have similarities in many respects,and the magnesium ion battery has the advantages of low cost,high energy density,low risk and no dendrite,it has received extensive attention.Although magnesium ion batteries may not be as good as lithium batteries in small power equipment,magnesium ion batteries have great development prospects in large-load charging and discharging equipment?such as electric cars,etc.?because of their own advantages.Since magnesium ion batteries are now in the preliminary research stage,the positive electrode materials and electrolytes suitable for magnesium ion batteries have always been the focus and difficulty of research.In this paper,based on the relevant literature and on the basis of previous research work,The research and experimental results of magnesium ion batteries are as follows:?1?The ternary cathode materials with different ratios of two components were prepared by modified high temperature solid phase method,namely MgNi_1/2Co_1/10Mn_1/5O₂ and MgNi_1/2Co_1/8Mn_1/7O₂.The precursors of the two materials were subjected to thermogravimetric analysis to determine the calcination temperature.From the X-ray diffraction pattern and the scanning electron micrograph,the sample particles prepared by the improved high-temperature solid phase method were more uniformly dispersed.The Mg?AlCl₂EtBu?₂/THF solution prepared in the experiment was used as the electrolyte,and the magnesium plate was used as the battery negative electrode to assemble the button battery.The battery was first discharged at 0.1 C rate.The results showed that MgNi_1/2Co_1/10Mn_1/5O₂ and The specific discharge capacities of MgNi_1/2Co_1/8Mn_1/7O₂ are 86 mAh/g and 71 mAh/g,respectively.When the magnification is increased to 2 C,the discharge specific capacity of MgNi_1/2Co_1/8Mn_1/7O₂ is greatly attenuated,which needs further study.Cyclic voltammetry tests show that magnesium ions can be reversibly embedded and embedded during charge and discharge;cycle performance tests show that the capacity retention ratio of both is better after 100 cycles;Comprehensive comparative analysis shows that the button cell of MgNi_1/2Co_1/10Mn_1/5O₂ assembled has better electrochemical performance.It has the potential to become a positive electrode material for magnesium ion batteries.?2?The elemental doping of Mg_0.5Zr₂?PO₄?₃ was carried out by improved high temperature solid phase method and sol-gel method,and Mg_0.9Zr_1.2Ni_0.82?PO₄?₃ was prepared by substituting nickel ion as a part of zirconium ion in Mg_0.5Zr₂?PO₄?₃.The experimental results show that the solid electrolyte sample prepared by sol-gel method has better density and electrical conductivity at 850?,which can reach 5.3×10^-6S/cm.Lastly,systematically refines and summarizes the work of this paper.It summarizes and summarizes the problems encountered in the research process and the existing shortcomings,in order to provide guiding suggestions for future research work.