Preparationand Characterization of Silicon-doped Garnet Li7La3Zr2O12 Solid Electrolyte
Garnet solid electrolyte Li7La3Zr2O12(LLZO)has been widely studied because of its high lithium ion conductivity,wide chemical window and good lithium metal stability.In order to further improve its electrochem-ical performance and obtain a stablecubic phase structure,Si-doped LLZO(Li7La3Zr2-xSixO12)solid electrolytes were prepared by high temperature solid state method.The effects of Si doping amount x on the phase composi-tion,crystal structure,micro-morphology,relative density,lithium ionic conductivity and conductance activa-tion energy of sintered ceramic sheets were investigated.The results show that with the increase of Si doping con-tent x,the porosity of Li7La3Zr2_xSixO12 sintered ceramics decreases,the relative density increases and the lithi-um ion conductivity increases at first and then decreases with the increase of Si doping content x.When the Si doping content is 0.24,the lithium ion conductivity of Li7La3Zr2_xSixO12 sintered ceramic sheet reaches the maxi-mum value of 4.86×10-4 S·cm-1 and the conductance activation energy reaches the lowest value of 0.32 eV.
solid electrolyteLi7La3Zr2O12lithium ion conductivitySi doping
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