Flexible supercapacitors have advanced rapidly in recent years and contributed to the development of wearable electronics. However, the operating temperature of the flexible supercapacitors usually falls within a narrow range, because of the constraints of the electrode materials and the electrolytes. Here, we report a flexible supercapacitor that can operate at extreme temperatures (down to −40 °C and up to 200 °C) with excellent electrochemical property and high durability. This device allows a maximum area specific capacitance of 330 mF/cm². It has 2 F/cm³ volume specific capacitance and 1.7 mWh/cm³ energy density. The high stability of this supercapacitor enables 90% capacitance retention after 10⁵ cycles. Moreover, deformation at extreme temperature does not reduce its energy storage ability.

中文翻译：

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基于混合碳膜电极的柔性耐高温超级电容器

近年来，柔性超级电容器发展迅速，并为可穿戴电子产品的发展做出了贡献。然而，由于电极材料和电解质的限制，柔性超级电容器的工作温度通常落在狭窄的范围内。在这里，我们报告了一种柔性超级电容器，该电容器可以在极端温度（低至-40°C至200°C）下工作，具有出色的电化学性能和高耐久性。该器件允许的最大面积比电容为330 mF / cm ²。它具有2 F / cm ^3的体积比电容和1.7 mWh / cm ^3的能量密度。该超级电容器的高稳定性可在10 ⁵之后实现90％的电容保持率周期。而且，在极端温度下的变形不会降低其能量存储能力。