Improving Lithium-ion Migration of Li7La3Zr2O12 by Co-doping
Li7La3Zr2O12(LLZO)solid electrolyte holds immense potential for application in all-solid-state lithium batteries due to its superior comprehensive performance.However,its relatively low Li+conductivity hinders the battery's performance.To further improve its Li+conductivity,this study stabilized it in the cubic phase by introducing a certain amount of Ga doping at lithium sites.Additionally,Cr3+,Sc3+,and Gd3+with different radii were separately doped at zirconium sites to investigate their effects on the LLZO structure and properties.The results demonstrate that when co-doped with Ga and Sc to prepare Li6.4Ga0.25La3Zr1.85Sc0.15O12,it exhibits the highest Li+conductivity,reaching 1.20× 10-3 S/cm,with an activation energy of only 0.22 eV.
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