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
The sandwich structured silicon thin film anodes with lithium phosphorus oxynitride （LiPON） coating are synthesized via the radio frequency magnetron sputtering method, whereas the thicknesses of both layers are in ...The sandwich structured silicon thin film anodes with lithium phosphorus oxynitride （LiPON） coating are synthesized via the radio frequency magnetron sputtering method, whereas the thicknesses of both layers are in the nanometer range, i.e. between 50 and 200 nm. In this sandwich structure, the separator simultaneously functions as a flexible substrate, while the LiPON layer is regarded as a protective layer. This sandwich structure combines the advantages of flexible substrate, which can help silicon release the compressive stress, and the LiPON coating, which can provide a stable artificial solid- electrolyte interphase （SEI） film on the electrode. As a result, the silicon anodes are protected well, and the cells exhibit high reversible capacity, excellent cycling stability and good rate capability. All the results demonstrate that this sandwich structure can be a promising option for high performance Si thin film lithium ion batteries.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.
基金The authors are grateful to the financial support of the National Natural Science Foundation of China （under Grant No. 61176003）.
文摘The sandwich structured silicon thin film anodes with lithium phosphorus oxynitride （LiPON） coating are synthesized via the radio frequency magnetron sputtering method, whereas the thicknesses of both layers are in the nanometer range, i.e. between 50 and 200 nm. In this sandwich structure, the separator simultaneously functions as a flexible substrate, while the LiPON layer is regarded as a protective layer. This sandwich structure combines the advantages of flexible substrate, which can help silicon release the compressive stress, and the LiPON coating, which can provide a stable artificial solid- electrolyte interphase （SEI） film on the electrode. As a result, the silicon anodes are protected well, and the cells exhibit high reversible capacity, excellent cycling stability and good rate capability. All the results demonstrate that this sandwich structure can be a promising option for high performance Si thin film lithium ion batteries.
