Enhanced ionic conductivity of an F−-assisted Na3Zr2Si2PO12 solid electrolyte for solid-state sodium batteries†
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Abstract
Na3Zr2Si2PO12 (NZSP) is considered to be one of the most promising solid electrolytes for solid-state sodium batteries. However, the low ionic conductivity of NZSP is one of the main challenges for its practical application. Herein, an F− assisting strategy to improve the ionic conductivity of NZSP is proposed. The F− assisting in NZSP electrolyte promotes the formation of a microstructure with large grains, low grain boundary concentration and high relative density, which is favorable to obtain high ionic conductivity. Consequently, the F−-assisted NZSP solid electrolyte exhibits a high ionic conductivity of 1.41 × 10−3 S cm−1 at 27 °C, which is about six times that of the un-assisted NZSP electrolyte (2.32 × 10−4 S cm−1). Moreover, the Na/Na3V2(PO4)3 solid-state sodium battery with the F−-assisted NZSP electrolyte exhibits an excellent cyclability with 97.8% capacity retention (85.9 mA h g−1) after 100 cycles at 0.5C at 40 °C. This F− assisting strategy provides a new way for the development of other classes of ceramic solid electrolytes for solid-state batteries.
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