Properties and application of low-cost Nb-doped Li7La3Zr2O12 solid electrolyte
Solid-state batteries have attracted considerable attention due to their outstanding performance in energy density,cycle life and safety.The core component of such batteries is the solid electrolyte material.Oxide solid electrolytes with garnet structure,such as Li7La3Zr2O12(LLZO),have been widely studied due to their broad electrochemical stability window,excellent ion conductivity,chemical stability and straightforward fabrication process.In this study,Nb doping was employed to modify LLZO,leading to the successful synthesis of Li6.75La3Zr1.75Nb0.25O12(LLZNO)oxide solid electrolyte.It exhibited an ion conductivity of 7.79×10-4 S/cm without significant increase in the fabrication cost.This material was coated onto the surface of polyethylene(PP)membranes to form PP-LLZNO membranes,which demonstrated excellent thermal stability and ion conductivity.Compared with the batteries assembled with Al2O3 coated membranes or solid electrolyte Li6.75La3Zr.75Ta0.25O12(LLZTO)coated membranes,the button cells and pouch cells assembled with PP-LLZNO coated membranes showed superior capacity retention rates of 84.99％(50 cycles)and 57.40％(100 cycles),respectively.This work provides reference for the large-scale production of solid electrolytes and its application in solid-state batteries.
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