Ultrahigh-rate wire-shaped supercapacitor based on graphene fiber

作者：Yu, Jiali; Wang, Mei; Xu, Ping; Cho, Seung-Hyun; Suhr, Jonghwan; Gong, Ke; Meng, Linghui; Huang, Yudong^*; Byun, Joon-Hyung; Oh, Youngseok; Yan, Yushan; Chou, Tsu-Wei^*

来源：Carbon, 2017, 119: 332-338.

DOI：10.1016/j.carbon.2017.04.052

• CARBON NANOTUBE FILMS
• ALL-SOLID-STATE
• MICRO-SUPERCAPACITORS
• YARN SUPERCAPACITORS
• PERFORMANCE
• ELECTRODES
• NANOWIRE
• DENSITY

The emerging wire-shaped supercapacitors (WSSs) have motivated tremendous research interests in energy storage devices. However, challenges still exist in the pursuit of high-rate performance WSS. Here, a graphene fiber made from chemical vapor deposition grown laminated graphene sheet is adopted to form a WSS which exhibits an exceptional rate capability with a relaxation time constant of 1.4 ms, smallest among WSSs reported to date. Furthermore, the resulting WSS can be charged-discharged at a high scan rate of 100 V s(-1) while maintaining good capacitive behavior. When the scan rate increased by 5000 times, from 20 mV s(-1) to 100 V s(-1), the graphene fiber based WSS maintains 38.6% of its original capacitance. After 10,000 galvanostatic charge-discharge cycles, the specific capacitance retains over 105%, demonstrating a long cycle stability.

• 出版日期2017-8
• 单位哈尔滨工业大学