Enhancing ionic conductivity of garnet-type Nb-doped Li_(7)La_(3)Zr_(2)O_(12)by cerium doping  

作　　者：Daming Liu Yuan Hou Chaoke Bulin Ruichao Zhao Bangwen Zhang 

机构地区：[1]Analytical and Testing Center,Inner Mongolia University of Science and Technology,Baotou,014010,China [2]School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou,014010,China [3]School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing,401331,China

出　　处：《Journal of Rare Earths》2024年第9期1740-1746,I0004,共8页稀土学报（英文版）

基　　金：Project supported by the Scientific Research Startup Fund of Inner Mongolia University of Science and Technology(0303052202);Natural Science Foundation of Inner Mongolia Autonomous Region(2020ZD17,2022FX08)。

摘　　要：We investigated the effect of additional doping with Ce on the ionic conductivity of the Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(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 Li_(6.5)La_(3)Zr_(1.5-x)Nb_(0.5)Ce_(x)O_(12)(x=0.125)exhibits a lower activation energy(E_(a)=0.39 eV)than Li_(6.5)La_(3)Zr_(1.5)Nb_(0.5)O_(12)(LLZNO)(E_(a)=0.41 eV).Furthermore,Ce doping leads to an increase in Li~+conductivity 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 results demonstrate that the LLZNCO ceramics are promising candidates for potential solid-state electrolytes for Li-ion batteries.

关 键 词：Rare earths Solid state electrolyte Ionic conductivity DOPING 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ174.1[化学工程—陶瓷工业]