Research On The Performance Of Quasi-solid Electrolytes Based On Aluminum And Zirconium Pillared Montmorillonite For Lithium Batteries

In recent decades,with the rapid development of lithium-ion batteries and the country's emphasis on energy materials,the battery applications have become more widely used.However,the main electrolyte used in lithium-ion batteries is organic electrolytes,which can easily lead to flammable and explosive problems,and such issues have caused great concern.Compared with the inorganic solid electrolyte,polymer solid electrolyte,and composite solid electrolyte in the field of lithium battery electrolyte,the lithium quasi-solid electrolyte in this paper has high ionic conductivity,high thermal stability,low cost,simple synthesis process,high safety,and excellent battery performance.The preparation of the lithium quasi-solid electrolyte in this paper is obtained by combining the ionic liquid with excellent properties and a two-dimensional layered porous material.This quasi-solid electrolyte has both the excellent performance of an ionic liquid and the mechanical hardness and nano-meter interface of a two-dimensional layered porous material.Besides,the assembled lithium battery has excellent battery performance.The study of solid electrolyte and battery performance is mainly divided into the following sections:?1?Considering the cost and output of the two-dimensional layered porous material in this paper,the pillared montmorillonite was selected as the matrix of the quasi-solid electrolyte in this paper,which was regarded as the innovation point of this paper.The preparation of pillared montmorillonite was based on sodium-based montmorillonite?Na-MMT?.Different pillared agents were added in the Na-MMT,and aluminum pillared montmorillonite?Al-PILC?and zirconium pillared montmorillonite?Zr-PILC?were obtained by stirring,ultrasonic and calcination.The Na-MMT,Al-PILC and Zr-PILC were characterized by X-ray diffraction?XRD?,thermogravimetric and differential thermal analysis?TG/DSC?,specific surface desorption characterization?BET?,and scanning electron microscope?SEM?.?2?0%,5%,10%,15%,20%,and 25%lithium liquids?Li-IL?were respectively obtained by mixing LiNTF₂ used as a solute with EMIMNTF₂ used as a solvent.Six Na-MMT-based quasi-solid electrolytes?Li-IL@Na-MMT QSE?and six Al-PILC-based quasi-solid electrolytes?Li-IL@Al-PILC QSE?were prepared by mixing Na-MMT or Al-PILC with different mass concentrations of Li-IL.The electrochemical performance of those quasi-solid electrolytes were tested to obtain the best mass concentration of Li-IL.At the same time,the mass ratio of the matrix in the quasi-solid electrolyte was changed,and the tests,such as the cyclic voltammetry?CV?,were used to characterize the solid electrolyte,so as to obtain the optimal substrate mass ratio.The Li-IL@Al-PILC electrolyte has an ionic conductivity of up to 2.13×10^-3S/cm at room temperature.When lithium iron phosphate?Li Fe PO₄?is used as the anode,the specific capacity of the battery reaches 120mAh/g at 0.5C after1000cycles.Besides,electrolyte has good inhibition of lithium dendrite.?3?Similarly,0%,5%,10%,15%,20%,and 25%lithium liquids?Li-IL?were respectively obtained by mixing LiNTF₂ used as a solute with EMIMNTF₂ used as a solvent.Six Zr-PILC-based quasi-solid electrolytes?Li-IL@Al-PILC QSE?were prepared by mixing Zr-PILC with different mass concentrations of Li-IL.The electrochemical performance of those quasi-solid electrolytes were tested to obtain the best mass concentration of Li-IL.At the same time,the variables were controlled,and the mass ratio of the zirconium matrix in the electrolyte was changed,and cyclic voltammetry and other characteristics were performed.Find the best mass ratio,and then get the best zirconium quasi-solid electrolyte.The Li-IL@Zr-PILC electrolyte has an ionic conductivity of up to 6.08×10^-4S/cm at room temperature.When lithium iron phosphate is used as the anode,the specific capacity of the battery reaches 120 mAh/g at 0.5C after 100 cycles.