A Flexible and High-Voltage Internal Tandem Supercapacitor Based on Graphene-Based Porous Materials with Ultrahigh Energy Density

作者：Zhang, Fan; Lu, Yanhong; Yang, Xi; Zhang, Long; Zhang, Tengfei; Leng, Kai; Wu, Yingpeng; Huang, Yi; Ma, Yanfeng; Chen, Yongsheng^*

来源：Small, 2014, 10(11): 2285-2292.

DOI：10.1002/smll.201303240

• FUEL-CELL STACKS
• ELECTRODE MATERIALS
• AQUEOUS SUPERCAPACITORS
• CARBON MATERIALS
• SURFACE-AREA
• IONIC LIQUID
• OXIDE SHEETS
• PORE-SIZE
• PERFORMANCE
• FABRICATION

Pursuing higher working voltage and packaged energy density, an internal tandem supercapacitor has been successfully designed and fabricated based on graphene-based porous carbon hybrid material. Compared with the packaged energy density of 27.2 Wh kg(cell)(-1) and working voltage of 3.5 V using EMIMBF4 electrolyte for the conventional single-cell supercapacitor, the internal tandem device with the same material achieves a much higher working voltage of 7 V as well as a significantly improved energy density of 36.3 Wh kg(cell)(-1) (increased by 33%), which is also about 7 times of that of the state-of-art commercial supercapacitors. A flexible internal tandem device is also designed and fabricated and demonstrated similar excellent performance.

• 出版日期2014-6-12
• 单位南开大学