Pseudo-capacitor device for aqueous electrolytes
Abstract
A pseudo-capacitor having a high energy storage capacity develops a double layer capacitance as well as a Faradaic or battery-like redox reaction, also referred to as pseudo-capacitance. The Faradaic reaction gives rise to a capacitance much greater than that of the typical ruthenate oxide ultracapacitor which develops only charge separation-based double layer capacitance. The capacitor employs a lead and/or bismuth/ruthenate and/or iridium system having the formula A{sub 2}[B{sub 2{minus}x}Pb{sub x}]O{sub 7{minus}y}, where A=Pb, Bi, and B=Ru, Ir, and O<=}1 and O<0.5 and limits the amount of ruthenate and/or iridium in the electrodes while increasing the energy storage capacity. The ruthenate can be synthesized at low temperatures (40--80 C) to form a compound with a high surface area and high electronic conductivity which, in combination with the increased pseudo-capacitance, affords high energy/power density in the pseudo-capacitor. The amount of expensive ruthenate and iridium can be substantially reduced in the pseudo-capacitor by increasing the lead content while improving energy storage capacity. 8 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 321180
- Patent Number(s):
- 5841627
- Application Number:
- PAN: 8-868,176
- Assignee:
- PTO; SCA: 250400; PA: EDB-99:029234; SN: 99002058522
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 24 Nov 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; CAPACITIVE ENERGY STORAGE EQUIPMENT; CAPACITORS; DESIGN; RUTHENIUM COMPOUNDS; SURFACE AREA; ELECTRIC CONDUCTIVITY; IRIDIUM COMPOUNDS; LEAD; BISMUTH
Citation Formats
Prakash, J, Thackeray, M M, Dees, D W, Vissers, D R, and Myles, K M. Pseudo-capacitor device for aqueous electrolytes. United States: N. p., 1998.
Web.
Prakash, J, Thackeray, M M, Dees, D W, Vissers, D R, & Myles, K M. Pseudo-capacitor device for aqueous electrolytes. United States.
Prakash, J, Thackeray, M M, Dees, D W, Vissers, D R, and Myles, K M. Tue .
"Pseudo-capacitor device for aqueous electrolytes". United States.
@article{osti_321180,
title = {Pseudo-capacitor device for aqueous electrolytes},
author = {Prakash, J and Thackeray, M M and Dees, D W and Vissers, D R and Myles, K M},
abstractNote = {A pseudo-capacitor having a high energy storage capacity develops a double layer capacitance as well as a Faradaic or battery-like redox reaction, also referred to as pseudo-capacitance. The Faradaic reaction gives rise to a capacitance much greater than that of the typical ruthenate oxide ultracapacitor which develops only charge separation-based double layer capacitance. The capacitor employs a lead and/or bismuth/ruthenate and/or iridium system having the formula A{sub 2}[B{sub 2{minus}x}Pb{sub x}]O{sub 7{minus}y}, where A=Pb, Bi, and B=Ru, Ir, and O<=}1 and O<0.5 and limits the amount of ruthenate and/or iridium in the electrodes while increasing the energy storage capacity. The ruthenate can be synthesized at low temperatures (40--80 C) to form a compound with a high surface area and high electronic conductivity which, in combination with the increased pseudo-capacitance, affords high energy/power density in the pseudo-capacitor. The amount of expensive ruthenate and iridium can be substantially reduced in the pseudo-capacitor by increasing the lead content while improving energy storage capacity. 8 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 24 00:00:00 EST 1998},
month = {Tue Nov 24 00:00:00 EST 1998}
}