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A hybrid redox-supercapacitor system with anionic catholyte and cationic anolyte

  • Author(s): Wang, B
  • Maciá-Agulló, JA
  • Prendiville, DG
  • Zheng, X
  • Liu, D
  • Zhang, Y
  • Boettcher, SW
  • Ji, X
  • Stucky, GD
  • et al.

A significant challenge for energy storage technologies is to realize battery-level energy density and capacitor-level durability and power density in one device. By introducing an electrolyte composed of an anionic catholyte and a cationic anolyte into a symmetric carbon-based supercapacitor configuration, a hybrid electrochemical battery-supercapacitor system using soluble redox species delivers significantly improved energy density from 20 to 42 W.h/kg (based on the electrode mass) and stable capacities for > 104 cycles. The ionic species formed in the electrolyte are studied by UV-Vis, Raman and mass spectroscopy to probe the energy storage mechanism. The strategy is general and may provide a route to critically-needed fast-charging devices with both high energy density and power. © 2014 The Electrochemical Society.

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