Room-temperature solid-state sodium batteries (SSBs) are viewed as one of the most promising candidates for next-generation energy storage devices because of their cost-effectiveness, safety performance, and high energy density. Na⁺ ion superionic conductor (NASICON) type solid electrolyte (SE) shows great perspective due to its high ionic conductivity at room temperature. However, the high interfacial resistance between Na metal anode and NASICON SE is still thwarting the stable operation of SSBs. In this work, we successfully reduce the Na|NASICON interfacial resistance from 1658 to 101 Ω·cm² by lowering surface tension of Na metal via compositing Na metal with amorphous SiO₂. Enabled by the enhanced interface contact, the solid-state Na-SiO₂|NASICON|Na-SiO₂ symmetric cell can endure current density up to 500 μA/cm² and stably cycle for more than 135 h, while Na|NASICON|Na symmetric cell shorts in less than 10 h under 100 μA/cm². This Letter provides an effective route to form close contact between Na metal anode and NASICON SE and fuels studies concerning Na|NASICON interface in the future.

中文翻译：

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基于NASICON的固态钠电池用Na-SiO ₂复合阳极降低界面电阻

室温固态钠电池（SSB）由于其成本效益，安全性能和高能量密度而被视为下一代储能设备的最有希望的候选者之一。Na ⁺离子超离子导体（NASICON）型固体电解质（SE）由于在室温下具有较高的离子电导率而具有广阔的前景。但是，Na金属阳极和NASICON SE之间的高界面电阻仍然阻碍了SSB的稳定运行。从1658 NASICON界面电阻至101Ω·cm的|在这项工作中，我们成功地将减少的Na ²通过经由与非晶质的SiO合成金属Na降低金属Na表面张力₂。通过增强的界面接触实现固态Na-SiO ₂| NASICON | Na-SiO ₂对称电池可承受高达500μA/ cm ^2的电流密度，并稳定地循环超过135 h，而Na | NASICON | Na对称电池在100μA/ cm ²下不到10 h短路。这封信提供了一条在Na金属阳极与NASICON SE之间形成紧密接触的有效途径，并为将来有关Na | NASICON界面的研究提供了燃料。