Rechargeable Na‐ion batteries (NIBs) are attractive large‐scale energy storage systems compared to Li‐ion batteries due to the substantial reserve and low cost of sodium resources. The recent rapid development of NIBs will no doubt accelerate the commercialization process. As one of the indispensable components in current battery systems, organic liquid electrolytes are widely used for their high ionic conductivity and good wettability, but the low thermal stability, especially the easy flammability and leakage make them at risk of safety issues. The booming solid‐state batteries with solid‐state electrolytes (SSEs) show promise as alternatives to organic liquid systems due to their improved safety and higher energy density. However, several challenges including low ionic conductivity, poor wettability, low stability/incompatibility between electrodes and electrolytes, etc., may degrade performance, hindering the development of practical applications. In this review, an overview of Na‐ion SSEs is first outlined according to the classification of solid polymer electrolytes, composite polymer electrolytes, inorganic solid electrolytes, etc. Furthermore, the current challenges and critical perspectives for the potential development of solid‐state sodium batteries are discussed in detail.

中文翻译：

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固态钠电池

与钠离子电池相比，可充电钠离子电池（NIB）是吸引人的大型储能系统，因为钠离子电池的储备量大且成本低。NIB的快速发展无疑将加速商业化进程。作为当前电池系统中必不可少的组件之一，有机液体电解质因其高离子电导率和良好的润湿性而被广泛使用，但是其低的热稳定性，尤其是易燃性和易泄漏性使它们面临安全问题的风险。蓬勃发展的带有固态电解质（SSE）的固态电池由于具有更高的安全性和更高的能量密度，有望成为有机液体系统的替代品。但是，一些挑战包括离子传导率低，润湿性差，电极与电解质之间的低稳定性/不相容性等可能会降低性能，从而阻碍实际应用的发展。在这篇综述中，首先根据固体聚合物电解质，复合聚合物电解质，无机固体电解质等的分类概述了Na-离子SSE。电池进行了详细讨论。