Three-Dimensional Holey Graphene Frameworks Based High-Performance Supercapacitors

Highest combined gravimetric and volumetric capacitance to date  High surface area  Higher ion transport rates  Electrical conductivity about 1 to 2 orders of magnitude better than state-of-art materials

Batteries  Supercapacitors  Electric vehicles  Mobile electronics

Researchers at UCLA have developed novel three-dimensional holey graphene framework (HGF) materials for EC electrodes. The highly interconnected graphene sheets in the 3D network prevent restacking and maintain a high surface area, while the nanopores further boost the surface area. The entire HGF surface area is fully electrochemically active, resulting in higher ion transport rates, which is difficult to achieve in conventional porous carbon material. The HGF films exhibit electrical conductivity about 1 to 2 orders of magnitude better than the state-of-the-art material in commercial ECs. The HGF structure yields the highest combined gravimetric and volumetric capacitance to date.

Background

Electrochemical supercapacitors (ECs) have received considerable attention for their potential applications in areas such as electric vehicles and mobile electronic products. However, their widespread use is largely limited by their relatively low energy density. Graphene has received interest as an EC electrode material because of its high electrical conductivity, excellent mechanical flexibility, and exceptionally large surface area and capacitance. However, strong interactions between graphene sheets causes them to re-stack, which decreases the surface area and gravimetric capacitances. Moreover, volumetric performance is an important metric in applications with limited space and higher power density requirements. However, simultaneously achieving high gravimetric and volumetric capacitances remains a challenge.

Related Materials

Sun, H., Mei, L., Liang, J., Zhao, Z., Lee, C., Fei, H., Ding, M., Lau, J., Li, M., Wang, C. and Xu, X. Three-dimensional holey-graphene/niobia composite architectures for ultrahigh-rate energy storage. Science. 2017.
Xu, Y., Lin, Z., Zhong, X., Huang, X., Weiss, N.O., Huang, Y. and Duan, X. Holey graphene frameworks for highly efficient capacitive energy storage. Nature Communications. 2014.

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Tech ID/UC Case

29273/2014-346-0

Related Cases

2014-346-0

USA