Preparation and Properties of Na5-xY1-xZrxSi4O12 Sodium-ion Ceramic Solid Electrolyte
In recent years,sodium-ion solid-state batteries have gradually attracted attentions as a member of rechargeable batteries.In solid-state batteries,liquid electrolytes are avoided,thus diminishing the risks such as leakage and explosion.At present,it is still a challenge to increase the ionic conductivity of solid-state electrolytes.In this study,Zr4+was introduced into Na5YSi4O12(NYS),where NaNO3,YN3O9·6H2O,C8H20O4Si and ZrO(NO3)2·xH2O were used as starting materials.A solution-assisted solid-phase reaction method(SASSR)was employed to prepare the solid electrolytes Na5-xY1-xZrxSi4O12(x=0.04,0.06,0.08,0.10,0.12)with hexagonal crystal structure.The effect of Zr4+on ionic conductivity of Na5-xY1-xZrxSi4O12(NYZS)was studied,while the maximum ionic conductivity of 2.13 mS·cm-1 was achieved at x=0.08,with an activation energy of 0.222 eV.Compared with that of NYS,the conductivity of NYZS is greatly increased,due to the presence of sodium vacancies after Zr4+doping.In summary,Na5-xY1-xZrxSi4O12 is a competitive sodium-ion solid-state electrolyte,which is expected to become promising candidate for new generation of energy conversion.