Transition metal oxide, WO₃, has shown great potential in zinc-ion rechargeable batteries as cathode material, yet the poor structural stability and low capacity significantly hindered its further application. Herein, a 30 m water-in-salt electrolyte (WiSE) was rationally designed to construct a stable Zn–WO₃ battery. The relatively fewer free water molecules and lower desolvation barrier of [ZnCl₄]^2- ions in ZnCl₂ WiSE not only resulted in a wide electrochemical stability window, low depth of discharge, high reduction potential but also contributed to the limited dissolution of WO₃ and high electrochemical corrosion resistance. As a result, the assembled Zn–WO₃ battery with 30 m ZnCl₂ WiSE achieved a specific capacity of 94.8 mAh g⁻¹ at 0.1 A g⁻¹, energy density of 18.9 Wh kg⁻¹ at a power density of 747.3 W kg⁻¹ and capacitance retention of 94.8% after 1,000 cycles at a high rate of 1 A g⁻¹. Furthermore, a flexible quasi-solid-state Zn–WO₃ battery was fabricated using ZnCl₂ WiSE without adding adhesives, demonstrating great potential for the next-generation energy storage application.

过渡金属氧化物WO ₃作为正极材料在锌离子可充电电池中显示出巨大的潜力，但结构稳定性差和容量低严重阻碍了其进一步应用。在此，合理设计 30 m 盐包水电解质 (WiSE) 以构建稳定的 Zn-WO ₃电池。_{ZnCl 2} WiSE 中相对较少的游离水分子和较低的 [ZnCl ₄ ] ^2-离子去溶剂化势垒不仅导致电化学稳定性窗口宽、放电深度低、还原电位高，而且还导致 WO ₃的有限溶解和高耐电化学腐蚀性。因此，组装的 Zn–WO ₃30 m ZnCl ₂ WiSE电池 在 0.1 A g ^{-1时的比容量为 94.8 mAh g -1} ， 在功率密度为 747.3 W kg ^-1时的能量密度为 18.9 Wh kg ^-1 ， 1,000 次后的电容保持率为 94.8%以 1 A g ^-1的高速率循环。此外，在不添加粘合剂的情况下，使用 ZnCl ₂ WiSE 制造了柔性准固态 Zn–WO ₃电池，展示了下一代储能应用的巨大潜力。