Study On Preparation And Performance Regulation Of Solid Lithium Ion Conductor Materials

All-solid-state electrolytes have been the focus of research in recent years.Among them,the NASICON all-solid-state electrolyte LATP has attracted attention due to its high ionic conductivity,wide electrochemical stability window,and stability to air.It is a promising all-solid-state electrolyte.The content of this experimental study is the study of the preparation and performance regulation of solid lithium ion conductor materials.Hydrothermal synthesis method and one-step hydrothermal method are used to prepare porous LATP,and then the prepared porous LATP is doped into non-porous LATP.The main goal is It is to improve the lithium ion conductivity.（1）Hydrothermal synthesis method,using CTAB and polyether F127 as surfactants to prepare porous Li_1.3Al_0.3Ti_1.7（PO₄）₃,and analyze its morphology,pore information,and structure test.The results showed that:CTAB was used as a template to prepare porous LATP,and the pore size was concentrated at 3nm;Polyether F127 was used as a template to prepare porous LATP,and the pore size was concentrated at 3nm,4nm,6nm.（2）Using one-step hydrothermal method,using CTAB and polyether F127 as surfactants,the porous Li_1.3Al_0.3Ti_1.7（PO₄）₃ was prepared,and its morphology,pore information,and structure Perform anal ytical testing.The results showed that:CTAB was used as a template to prepare porous LATP,and the pore size was concentrated in the range of 2nm-6nm;Polyether F127 was used as a template to prepare porous LATP,and the pore size was concentratedly distributed at 3nm and 4nm.（3）The effect of non-porous LATP-doped porous LATP on ionic conductivity was studied by sol-gel method.Porous LATP prepared by doping hydrothermal synthesis CTAB as a template,when the doping ratio is 50wt%porous+50wt%non-porous,the electrolyte performance is optimal,and the ionic conductivity is 3.0×10^-4S/cm,which is purely porous.LATP(1.3×10^-4S/cm)is twice as high as about one order of magnitude higher than pure non-porous LATP(5.6×10^-5S/cm),and the activation energy is 0.23e V;doped with hydrothermal synthesis polyether F127 as a template The porous LATP prepared by the agent has the best electrolyte performance when the doping ratio is 40wt%porous+60wt%non-porous.The ionic conductivity is 2.1×10^-4S/cm,which is higher than that of pure porous LATP(6.3×10^-5S/cm).And pure non-porous LATP(5.6×10^-5S/cm)is about an order of magnitude higher,and the activation energy is 0.29e V;porous LATP prepared by doping one-step hydrothermal method CTAB as a template,when the doping ratio is 50wt%When porous+50wt%non-porous,the electrolyte performance is the best.The ionic conductivity is 3.7×10^-4S/cm,which is 1.5 times that of pure porous LATP(2.4×10^-4S/cm).It is pure non-porous LATP(1.6×10^-4S/cm),the activation energy is0.29e V;porous LATP prepared by doping one-step hydrothermal polyether F127 as a template,when the doping ratio is 40wt%porous+60wt%non-porous The electrolyte has the best performance.The ionic conductivity is 3.4×10^-4S/cm,which is more than twice that of pure porous LATP(1.7×10^-4S/cm)and pure non-porous LATP(1.6×10^-4S/cm).The energy is 0.28e V;the experimental results show that doping is indeed beneficial to the improvement of ionic conductivity.