With the boom of flexible electronic products and wearable devices, flexible energy storage devices, for example, supercapacitors with high performance, are attracting increasing interest. A flexible water‐deactivated polyelectrolyte hydrogel electrolyte with good mechanical properties and high ionic conductivity was prepared by using an anionic polymer, carboxy methyl cellulose, and a cationic monomer, methacrylamidopropyltrimethyl ammonium chloride. It was then applied in a supercapacitor with flexible activated carbon electrodes. This flexible supercapacitor possesses a high operating voltage of 2.1 V owing to the low electrochemical activity for water within the hydrogel as a result of the ‘molecular cages’ effect and hydrophilic interactions between functional groups and surrounding water molecules. Furthermore, this supercapacitor exhibits good flexibility and tailorability. As the first example of water‐deactivated polyelectrolyte hydrogel electrolytes in applications involving flexible high‐voltage supercapacitors, this work provides a platform for the design of energy storage devices with high energy density for flexible and wearable electronic devices.

中文翻译：

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水钝化的聚电解质水凝胶电解质，用于柔性高压超级电容器

随着柔性电子产品和可穿戴设备的兴起，柔性储能设备，例如高性能超级电容器，引起了越来越多的关注。通过使用阴离子聚合物，羧甲基纤维素和阳离子单体甲基丙烯酰胺基丙基三甲基氯化铵，制备了具有良好机械性能和高离子电导率的柔性水钝化聚电解质水凝胶电解质。然后将其应用于具有柔性活性炭电极的超级电容器中。由于“分子笼”效应以及官能团与周围水分子之间的亲水相互作用，水凝胶中的水具有较低的电化学活性，因此该柔性超级电容器具有2.1 V的高工作电压。此外，该超级电容器具有良好的灵活性和可定制性。作为水钝化聚电解质水凝胶电解质在涉及柔性高压超级电容器的应用中的第一个示例，这项工作为柔性和可穿戴电子设备的高能量密度储能设备设计提供了一个平台。