Fast Li^(+) migration in LiPON electrolytes doped by multi-valent Fe ions  

作　　者：Shuyu Zhou Ruixue Tian Aimin Wu Li Lin Hao Huang 

机构地区：[1]Key Laboratory of Energy Materials and Devices(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China [2]Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,Guangdong,China [3]School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China

出　　处：《Journal of Energy Chemistry》2022年第12期349-359,I0009,共12页能源化学（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(DUT20LAB123 and DUT20LAB307);the Natural Science Foundation of Jiangsu Province(BK20191167)。

摘　　要：Achieving superior ionic conductivity of Li PON solid electrolyte films is critical for the solid-state thinfilm batteries with high energy density.Here we describe a method of preparing Li PON with promising ionic migration capability and high work function by systematically tailoring the concentration of Fe ions doping.Fe-doped LiPON exhibits excellent ionic conductivity(1.08×10^(-5)S cm^(-1),nearly 10 times higher than the pristine LiPON),low ionic activation energy,and moderate equilibrium potential difference(versus LiCoO_(2),0.78 V)at room temperature.The favorable ionic mobility and electrochemical stability of Fedoped Li PON are fully confirmed.All-solid-state“Li/LiPON/LiCoO_(2)”TFB has been successfully constructed with a large specific capacity(~36.3μAh cm^(-2)μm^(-1)at 10μA cm^(-2))and good cycle performance(87.8%capacity retention after 40 cycles).Fe with the unique d-orbital electronic structure changes the local electron density of Li PON system with the weakened electrostatic constraint of PO_(3)N^(4-)tetrahedrons to Li^(+).A low Li^(+)migration barrier center is established around the Fe–N bridge bonds.

关 键 词：Solid electrolyte Fe-doped LiPON Ionic conductivity Work function Magnetron sputtering 

分 类 号：TM911[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]