Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering , Harbin Engineering University , Harbin 150001 , P. R. China.
ACS Appl Mater Interfaces. 2018 Jul 18;10(28):23834-23841. doi: 10.1021/acsami.8b06143. Epub 2018 Jul 9.
High-performance flexible energy storage devices are an important prerequisite to the utilization of various advanced wearable electronics, such as healthcare sensors and smart textiles. In this work, we design a wearable all-solid-state, all-in-one asymmetric supercapacitor by integrating current collectors, a separator, and negative and positive electrodes into a thin, flexible, and porous polyamide nanofiber film. The positive and negative electrodes are, respectively, electrodeposited onto each side of the carbon nanotube-modified porous polyamide nanofiber film to form the integrated and compact asymmetric cell. The all-in-one thin-film asymmetric supercapacitor is binder-, additive-, and metal current collector-free, which can effectively decrease the cost, simplify the assembly procedures, and increase the energy density. The assembled flexible all-in-one asymmetric supercapacitor with a compact structure shows high gravimetric and volumetric specific capacitances of 70 F g and 3.1 F cm under a current density of 0.5 A g in a neutral polyvinyl alcohol/LiCl gel electrolyte, respectively. Additionally, the all-in-one asymmetric cell displays a favorable volumetric energy density of 1.1 W h L, which is among the highest compared with other reported flexible solid-state supercapacitors. Notably, multiple cell units can be integrated in one piece of polyamide nanofiber film and connected in series to satisfy the need of high output voltage.
高性能柔性储能器件是利用各种先进的可穿戴电子产品（如医疗保健传感器和智能纺织品）的重要前提。在这项工作中，我们通过将集流器、隔板和正负极集成到薄而柔韧的多孔聚酰胺纳米纤维薄膜中，设计了一种可穿戴的全固态、一体式不对称超级电容器。正负极分别通过电沉积在经过碳纳米管改性的多孔聚酰胺纳米纤维薄膜的两侧上，形成集成且紧凑的不对称电池。一体式薄膜不对称超级电容器无粘合剂、添加剂和金属集流器，可有效降低成本、简化组装程序并提高能量密度。组装好的具有紧凑结构的柔性一体式不对称超级电容器在中性聚乙烯醇/氯化锂凝胶电解质中以 0.5 A g 的电流密度下表现出 70 F g 和 3.1 F cm 的高重量和体积比电容。此外，一体式不对称电池显示出 1.1 W h L 的有利体积能量密度，与其他报道的柔性固态超级电容器相比，这是最高的之一。值得注意的是，多个电池单元可以集成在一块聚酰胺纳米纤维薄膜上，并串联连接以满足高输出电压的需求。
