To main content

Geometrically confined favourable ion packing for high gravimetric capacitance in carbon-ionic liquid supercapacitors

Geometrically confined favourable ion packing for high gravimetric capacitance in carbon-ionic liquid supercapacitors

Category
Journal publication
Abstract
A supercapacitor, a safe and durable electrical energy storage device with fast charge–discharge capability, will achieve more widespread use if the specific energy can be improved. However, current understanding of pore characteristic effects on gravimetric capacitance has limited the development of electrode materials. We derive a model of ion packing in cylindrical nanopores, and it quantitatively reveals the significant impact of pore geometric characteristics on the gravimetric capacitance in neat ionic liquid, which is confirmed experimentally using a series of sponge-like carbons (carbon nanosponge). With the favourable ion packing proposed by the model, the electrode using the carbon nanosponge as an active material delivered double-layer capacitances of 290 F g−1 (20 °C) and 387 F g−1 (60 °C) with an operating cell voltage of 4 V. This study also provides systematical strategies for rational design of various carbon materials and ionic liquids by optimized ion packing for ultrahigh gravimetric capacitance.
Client
  • Norges forskningsråd / 245963
  • Norges forskningsråd / 215522
Language
English
Author(s)
  • Wang Xuehang
  • Zhou Haitao
  • Sheridan Edel
  • Walmsley John
  • Ren Dingding
  • Chen De
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Industry / Sustainable Energy Technology
  • SINTEF Industry / Materials and Nanotechnology
  • Norwegian University of Science and Technology
Year
2016
Published in
Energy & Environmental Science
ISSN
1754-5692
Volume
9
Issue
1
Page(s)
232 - 239