skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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):
5,841,627
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 = {1998},
month = {11}
}