In order to improve the ionic conductivity and relative density of lithium lanthanum zirconium oxide(LLZO)solid electrolyte,and achieve low-cost production of LLZO ceramics,Li6.28-xAl0.24La3Zr2O12-xFx(LALZOF),a solid electrolyte modified with F and Al3+,is synthesized through using a traditional solid phase method.The ionic conductivity and relative density of LALZOF ceramics are optimized by adjusting the adding amount of Al2O3 and LiF.It is indicated through SEM,PSD,and XRD analysis that F-and Al3+has been doped into LALZOF and stabilize the cubic phase,and F-can reduce the particle size of LALZOF powder.After high-temperature sintering,it is shown by SEM,EDS,EIS,and relative density tests that the addition of F-can promote the growth of LALZOF ceramics grain,which can enhance densification of the ceramics and improve the ionic conductivity of lithium.Moreover,F-is uniformly doped into LALZOF grains.As F-doping amount is 0.2 mol,LALZOF has the optimal performance,with a density of 86.28％and a total ionic conductivity of 4.30×10-4 S·cm-1.
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