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.

中文翻译：

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固态钠电池用F-辅助的Na3Zr2Si2PO12固体电解质的离子电导率提高

Na ₃ Zr ₂ Si ₂ PO ₁₂（NZSP）被认为是固态钠电池最有前途的固体电解质之一。但是，NZSP的低离子电导率是其实际应用的主要挑战之一。在这里，一个F ^-改善NZSP的离子性辅助战略提出。在F ^-在NZSP电解质协助促进与大粒径，低晶界浓度和高相对密度的微结构，这有利于获得高离子导电率的形成。因此，在F ^- -assisted NZSP固体电解质展品1.41×10高离子传导率^-3小号厘米在27°C下为^-1，约为非辅助NZSP电解质（2.32×10 ^-4 S cm ^-1）的六倍。此外，钠/钠₃ V ₂（PO ₄） ₃固态电池与F钠^- -assisted NZSP电解质表现出优良的可循环性有97.8％的容量保持率（85.9毫安汞柱^-1在以0.5C 100次循环后） 40℃。该F ^-协助战略为其他类固态电池陶瓷固体电解质的发展的新途径。