期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 28, 页码 23834-23841出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06143
关键词
all-in-one; compact structure; volumetric capacitance; wearable; supercapacitor
资金
- National Natural Science Foundation of China [51572052]
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(-1) and 3.1 F cm(-3) under a current density of 0.5 A g(-1) in a neutral polyvinyl alcohol/LiClgel electrolyte, respectively. Additionally, the all-in-one asymmetric cell displays a favorable volumetric energy density of 1.1 W h L-3, 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.
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