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 mi...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.展开更多
基金supported by the Fundamental Research Funds for the Central Universities(DUT20LAB123 and DUT20LAB307)the Natural Science Foundation of Jiangsu Province(BK20191167)。
文摘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.
