首页|Enhancing ionic conductivity of garnet-type Nb-doped Li7La3Zr2O12 by cerium doping
Enhancing ionic conductivity of garnet-type Nb-doped Li7La3Zr2O12 by cerium doping
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We investigated the effect of additional doping with Ce on the ionic conductivity of the Nb-doped Li7La3Zr2O12(LLZO)garnet ceramics using a combination of experimental and modeling approaches.Our results indicate that Ce doping can alter lattice parameters of the LLZNO,leading to the enhanced lithium ionic conductivity.The Ce,Nb co-doped LLZO(LLZNCO)structure with composition Li6.5La3Zr1.5-xNb..5CexO12(x=0.125)exhibits a lower activation energy(Ea=0.39 eV)than Li6.5La3Zr1.5Nb0.5O12(LLZNO)(Ea=0.41 eV).Furthermore,Ce doping leads to an increase in Li+con-ductivity from 6.4 × 10-4 to 7 × 10-4 S/cm at room temperature.In addition,we discuss the diffusivity and conductivity of our samples using ab initio molecular dynamics simulations and propose possible mechanisms to explain the enhanced Li-ion conductivity caused by co-doping with Ce and Nb.Our re-sults demonstrate that the LLZNCO ceramics are promising candidates for potential solid-state electro-lytes for Li-ion batteries.
Rare earthsSolid state electrolyteIonic conductivityDoping
Analytical and Testing Center,Inner Mongolia University of Science and Technology,Baotou,014010,China
School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou,014010,China
School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing,401331,China
Scientific Research Startup Fund of Inner Mongolia University of Science and TechnologyNatural Science Foundation of Inner Mongolia Autonomous RegionNatural Science Foundation of Inner Mongolia Autonomous Region
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