期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 45, 页码 39391-39398出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12047
关键词
microsupercapacitors; carbon fiber; flexible energy storage; wearable electronics; multifunctional electronics
资金
- BSAC, Berkeley Sensor and Actuator Center
- National Science Foundation Industry/University Cooperative Research Center
- US Army Aviation and Missile Research, Development and Engineering Center
Fiber-based supercapacitors have attracted significant interests because of their potential applications in wearable electronics. Although much progress has been made in recent years, the energy and power densities, mechanical strength, and flexibility of such devices are still in need of improvement for practical applications. Here, we demonstrate an ultrathin microcoaxial fiber supercapacitor (mu CFSC) with high energy and power densities (2.7 mW h/cm(3) and 13 W/cm(3)), as well as excellent mechanical properties. The prototype with the smallest reported overall diameter (similar to 13 mu m) is fabricated by successive coating of functional layers onto a single micro-carbon-fiber via a scalable process. Combining the simulation results via the electrochemical model, we attribute the high performance to the well-controlled thin coatings that make full use of the electrode materials and minimize the ion transport path between electrodes. Moreover, the mu CFSC features high bending flexibility and large tensile strength (more than 1 GPa), which make it promising as a building block for various flexible energy storage applications.
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