All-solid-state sodium batteries (ASSNBs), which combine the benefits of high safety and low cost, are expected to be an alternative or complementary storage technology to lithium ion batteries. Herein, we developed an aqueous tape casting technique for the continuous fabrication of ceramic sheets made of silicate-based Na₅YSi₄O₁₂ (NYS) Na⁺ ion superionic conductor for the first time. After sintering, the ceramics showed a total conductivity of 1.0 mS cm⁻¹ at room-temperature, low total activation energy of 0.30 eV, and wide electrochemical window of over 8 V. The critical current density of NYS tape against Na-metal electrodes can reach 2.2 mA cm⁻² and the galvanostatic cycling time is over 280 h under 0.8 mA cm⁻² and 0.8 mAh cm⁻². The obtained tape has high crystalline purity, dense microstructure, favorable mechanical properties (hardness H of 2 GPa and elastic modulus E of 45 GPa). This work not only highlights the potential of the scarcely studied silicate-based NYS ionic conductor as a functional separator, but also presents a cost-efficient and eco-friendly continuous fabrication using the aqueous tape casting technique, thus being expected to boost the practical application of NYS as solid-state electrolyte in ASSNBs.

全固态钠电池（ASSNBs）结合了高安全性和低成本的优点，有望成为锂离子电池的替代或补充存储技术。在此，我们首次开发了一种水性流延技术，用于连续制造由硅酸盐基 Na ₅ YSi ₄ O ₁₂ (NYS) Na ⁺离子超离子导体制成的陶瓷片材。烧结后，陶瓷在室温下表现出1.0 mS cm ^-1的总电导率，0.30 eV的低总活化能和超过8 V的宽电化学窗口。NYS胶带对金属钠电极的临界电流密度可以达到 2.2 mA cm ^{-2在0.8 mA cm -2}和0.8 mAh cm ^-2下，恒电流循环时间超过280小时。制得的带材结晶纯度高，组织致密，力学性能良好（硬度H为2 GPa，弹性模量E为45 GPa）。这项工作不仅突出了很少研究的硅酸盐基 NYS 离子导体作为功能性隔膜的潜力，而且还提出了一种使用水性流延技术的经济高效且环保的连续制造方法，从而有望促进实际应用纽约州作为 ASSNB 中的固态电解质。