The advent of foldable mobiles and electronic devices has persuaded the need for the development of safe, robust and durable flexible energy storage devices. With global temperatures plunging well below 0 °C in most parts of the globe during winters, it is vital to enhance the low temperature performance of these energy storage devices. Aqueous electrolytes for supercapacitors and batteries offer the most sustainable solution when compared to electrolytes made of organic solvents or ionic liquids. Here, we report an inverse-melting pluronic polymer gel electrolyte (PPGE) consisting of an amphiphilic pluronic polymer/water mixture that acts as a cryoprotectant thereby rendering flexible supercapacitors operational down to −30 °C. Organic ionic conductors (OIC) were introduced into the PPGE to boost ionic conductivity. The fabricated supercapacitors exhibit a specific capacitance of 436 Fg^-1 and 441 Fg^-1 at 25 °C with PiHI and PiBr as OIC, respectively (at 1 Ag^-1 current density). The same devices have a significantly higher capacitance of 140 Fg^-1 and 339 Fg^-1 at −30 °C. A maximum energy density of 16.8 Wh/kg and 11.77 Wh/kg were obtained at 25 °C and −30 °C, respectively. Additionally, the device with PiBr exhibits high capacitance retention of 70% at −30 °C. Furthrmore, the fabricated devices exhibit cooling performance recovery.

可折叠的移动设备和电子设备的出现已经说服了对开发安全，坚固和耐用的柔性储能设备的需求。在冬季，全球大部分地区的全球温度骤降至0°C以下，因此提高这些储能设备的低温性能至关重要。与由有机溶剂或离子液体制成的电解质相比，用于超级电容器和电池的水性电解质提供了最可持续的解决方案。在这里，我们报告了一种由两亲性普朗尼克聚合物/水混合物组成的反向熔化的普朗尼克聚合物凝胶电解质（PPGE），它起着防冻剂的作用，从而使柔性超级电容器的工作温度降低至-30°C。将有机离子导体（OIC）引入PPGE中以提高离子电导率。^分别在25°C下以PiHI和PiBr作为OIC时的^-1和441 Fg ^-1（在1 Ag ^-1电流密度下）。相同的器件在−30°C时具有明显更高的140 Fg ^-1和339 Fg ^-1电容。在25°C和-30°C下分别获得16.8 Wh / kg和11.77 Wh / kg的最大能量密度。此外，具有PiBr的器件在−30°C时具有70％的高电容保持率。此外，所制造的器件表现出冷却性能的恢复。