Three-Dimensional Holey Graphene Frameworks Based High-Performance Supercapacitors
- 技术优势
- 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
- 技术应用
- Batteries Supercapacitors Electric vehicles Mobile electronics
- 详细技术说明
- 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.
- *Abstract
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UCLA researchers in the Department of Chemistry have developed novel three-dimensional holey graphene framework (HGFs) materials for EC electrodes.
- *Principal Investigation
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Name: Xiangfeng Duan
Department:
Name: Yuxi Xu
Department:
- 其他
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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.Additional Technologies by these Inventors
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Tech ID/UC Case
29273/2014-346-0
Related Cases
2014-346-0
- 国家/地区
- 美国
