Solutions of 1 M NaClO₄ in mixtures of carbonates, including EC:PC 1:1 vol. (EP11), EC:DMC 1:1 vol. (ED11), EC:PC:DMC 1:1:3 vol. (EPD113) and EC:PC:DMC 3:1:1 vol. (EPD311), and 10–50% vol. sulfolane (SL) as co-solvent were investigated as flame- and oxidation-resistant electrolytes for sodium-ion battery. The dependence of important features, including thermal and fiery behavior, ionic conductivity and oxidative stability, on SL content as well as the compatibility with Na_0.44MnO₂ cathode materials are essentially reported. It was revealed that the presence of a moderate SL amount effectively promotes the electrolyte safety profile while maintaining acceptable conductivity. Amongst concerned samples, EPD311-based electrolytes with SL content within the optimized range (10–30% vol.) were found to exhibit the best balanced inherent properties. They also perform well when coupled with Na_0.44MnO₂ cathode in coin-type half-cells. Discharge capacity values of around 85–95 mAh·g⁻¹ (C/10 rate), with almost 100% capacity retention after 20 cycles and good rate capability were demonstrated. Remarkably, EPD311 + 10% SL electrolyte was able to deliver the full theoretical capacity of Na_0.44MnO₂ material (120 mAh·g⁻¹) at the C/20 rate.

1 M NaClO ₄在碳酸盐混合物中的溶液，包括EC：PC 1：1 vol。（EP11），EC：DMC 1：1 vol。（ED11），EC：PC：DMC 1：1：3 vol。（EPD113）和EC：PC：DMC 3：1：1 vol。（EPD311）和10–50％体积。研究了环丁砜（SL）作为助溶剂作为钠离子电池的阻燃和抗氧化电解质。重要特征（包括热和火热行为，离子电导率和氧化稳定性）对SL含量以及与Na _0.44 MnO ₂的相容性的依赖性基本上报道了阴极材料。揭示了适量的SL量的存在有效地提高了电解质安全性，同时保持了可接受的电导率。在相关样品中，发现SL含量在优化范围内（10-30％体积）的EPD311基电解质表现出最佳的平衡固有性能。当与硬币型半电池中的Na _0.44 MnO ₂阴极耦合时，它们的性能也很好。放电容量值约为85–95 mAh·g ^-1（C / 10速率），经过20个循环后几乎保持100％的容量，并且具有良好的速率容量。值得注意的是，EPD311 + 10％SL电解质能够提供Na _0.44 MnO ₂的全部理论容量C / 20速率下的材料（120 mAh·g ^-1）。