NASICON-structured Na_(3)Zr_(2)Si_(2)PO_(12)(NZSP)has been considered as one of the ideal electrolytes for all-solid-state sodium metal batteries(ASSSB).However,the practical application of NZSP-based ASSSB is hindere...NASICON-structured Na_(3)Zr_(2)Si_(2)PO_(12)(NZSP)has been considered as one of the ideal electrolytes for all-solid-state sodium metal batteries(ASSSB).However,the practical application of NZSP-based ASSSB is hindered by the low ionic conductivity and large interfacial resistance caused by the poor contact between NZSP and Na metal.Herein,the introduction of Fe_(2)O_(3) not only improves ionic conductivity and reduces activation energy by the doping of Fe^(3+)in the crystal structure of NZSP,but also reduces the interfacial resistance and enhances interface stability between NZSP and Na metal anode.The synergistic effects significantly enhance the cycling stability,rate capability,and critical current density of the symmetrical solid-state cells.The interfacial reaction mechanism indicates that Fe3+in the interface is reduced Fe2+by Na anode,which effectively even the electric-filed distribution and suppresses the dendrite growth.Consequently,the symmetric solid-state cells exhibit stable cycling performance for 1,500 h at 0.1 mA·cm−1/0.1 mA·h·cm−1 and over 900 h at 0.2 mA·cm−1/0.2 mA·h·cm−1.The Na|NZSP-0.075%Fe_(2)O_(3)|Na_(2)FePO_(4)F solid-state full cells display high capacity retention of 94.2%after 100 cycles at 0.5 C.The stable interface of NZSP/Na and improved ionic conductivity contribute to excellent electrochemical performance,which accelerates the practical application of ASSSB.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(22179071 and 52072217)the National Key R&D Program of China(2022YFB3807700)+3 种基金the Hubei Natural Science Foundation for Distinguished Young Scholars(2023AFA089)the Hubei Natural Science Foundation Innovation Group Project(2022CFA020)the Major Technological Innovation Project of Hubei Science and Technology Department(2019AAA164)Joint Funds of the Hubei Natural Science Foundation Innovation and Development(2022CFD034).
文摘NASICON-structured Na_(3)Zr_(2)Si_(2)PO_(12)(NZSP)has been considered as one of the ideal electrolytes for all-solid-state sodium metal batteries(ASSSB).However,the practical application of NZSP-based ASSSB is hindered by the low ionic conductivity and large interfacial resistance caused by the poor contact between NZSP and Na metal.Herein,the introduction of Fe_(2)O_(3) not only improves ionic conductivity and reduces activation energy by the doping of Fe^(3+)in the crystal structure of NZSP,but also reduces the interfacial resistance and enhances interface stability between NZSP and Na metal anode.The synergistic effects significantly enhance the cycling stability,rate capability,and critical current density of the symmetrical solid-state cells.The interfacial reaction mechanism indicates that Fe3+in the interface is reduced Fe2+by Na anode,which effectively even the electric-filed distribution and suppresses the dendrite growth.Consequently,the symmetric solid-state cells exhibit stable cycling performance for 1,500 h at 0.1 mA·cm−1/0.1 mA·h·cm−1 and over 900 h at 0.2 mA·cm−1/0.2 mA·h·cm−1.The Na|NZSP-0.075%Fe_(2)O_(3)|Na_(2)FePO_(4)F solid-state full cells display high capacity retention of 94.2%after 100 cycles at 0.5 C.The stable interface of NZSP/Na and improved ionic conductivity contribute to excellent electrochemical performance,which accelerates the practical application of ASSSB.
