Journal
ADVANCED MATERIALS
Volume 29, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201700470
Keywords
capillarity; collapsed carbon nanocages; compact supercapacitors; optimized porous structure; ultrahigh-volumetric energy density
Categories
Funding
- NSFC [51232003, 21373108, 51571110, 21473089, 21573107]
- 973 program [2013CB932902]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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High volumetric energy density combined with high power density is highly desired for electrical double-layer capacitors. Usually the volumetric performance is improved by compressing carbon material to increase density but at the much expense of power density due to the deviation of the compressed porous structure from the ideal one. Herein the authors report an efficient approach to increase the density and optimize the porous structure by collapsing the carbon nanocages via capillarity. Three samples with decreasing sizes of meso- and macropores provide us an ideal model system to demonstrate the correlation of volumetric performance with porous structure. The results indicate that reducing the surplus macropores and, more importantly, the surplus mesopores is an efficient strategy to enhance the volumetric energy density while keeping the high power density. The optimized sample achieves a record-high stack volumetric energy density of 73 Wh L-1 in ionic liquid with superb power density and cycling stability.
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