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Title: Electrolytic cell stack with molten electrolyte migration control

Abstract

An electrolytic cell stack includes inactive electrolyte reservoirs at the upper and lower end portions thereof. The reservoirs are separated from the stack of the complete cells by impermeable, electrically conductive separators. Reservoirs at the negative end are initially low in electrolyte and the reservoirs at the positive end are high in electrolyte fill. During stack operation electrolyte migration from the positive to the negative end will be offset by the inactive reservoir capacity. In combination with the inactive reservoirs, a sealing member of high porosity and low electrolyte retention is employed to limit the electrolyte migration rate. 5 figs.

Inventors:
; ;
Publication Date:
Research Org.:
International Fuel Cells Corp., South Windsor, CT (USA)
OSTI Identifier:
6668851
Patent Number(s):
PATENTS-US-A6026819
Application Number:
ON: DE89000107
Assignee:
Dept. of Energy TIC; EDB-89-001979
DOE Contract Number:
AC21-79ET15440
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ELECTROLYTES; MIGRATION; MOLTEN CARBONATE FUEL CELLS; DESIGN; ANODES; CATHODES; CERAMICS; ELECTROLYTIC CELLS; INVENTIONS; POROSITY; DIRECT ENERGY CONVERTERS; ELECTROCHEMICAL CELLS; ELECTRODES; FUEL CELLS; HIGH-TEMPERATURE FUEL CELLS 300501* -- Fuel Cells-- Design & Development

Citation Formats

Kunz, H.R., Guthrie, R.J., and Katz, M. Electrolytic cell stack with molten electrolyte migration control. United States: N. p., 1987. Web.
Kunz, H.R., Guthrie, R.J., & Katz, M. Electrolytic cell stack with molten electrolyte migration control. United States.
Kunz, H.R., Guthrie, R.J., and Katz, M. 1987. "Electrolytic cell stack with molten electrolyte migration control". United States. doi:.
@article{osti_6668851,
title = {Electrolytic cell stack with molten electrolyte migration control},
author = {Kunz, H.R. and Guthrie, R.J. and Katz, M.},
abstractNote = {An electrolytic cell stack includes inactive electrolyte reservoirs at the upper and lower end portions thereof. The reservoirs are separated from the stack of the complete cells by impermeable, electrically conductive separators. Reservoirs at the negative end are initially low in electrolyte and the reservoirs at the positive end are high in electrolyte fill. During stack operation electrolyte migration from the positive to the negative end will be offset by the inactive reservoir capacity. In combination with the inactive reservoirs, a sealing member of high porosity and low electrolyte retention is employed to limit the electrolyte migration rate. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1987,
month = 3
}
  • An electrolytic cell stack includes inactive electrolyte reservoirs at the upper and lower end portions thereof. The reservoirs are separated from the stack of the complete cells by impermeable, electrically conductive separators. Reservoirs at the negative end are initially low in electrolyte and the reservoirs at the positive end are high in electrolyte fill. During stack operation electrolyte migration from the positive to the negative end will be offset by the inactive reservoir capacity. In combination with the inactive reservoirs, a sealing member of high porosity and low electrolyte retention is employed to limit the electrolyte migration rate.
  • This patent describes an electrolytic cell stack including a plurality of electrolytic cells with electrically conductive, electrolyte impermeable separator sheets between adjacent cells in the stack, the electrolytic cells including a porous anode member, a porous cathode member and a porous matrix for molten electrolyte disposed in the stack between major surfaces of the anode and cathode members. The stack has a negative end portion and a positive end portion at opposite ends thereof with the edge surfaces of the cells forming a first stack face for admitting a supply of oxidant gas and the edge surfaces forming a secondmore » stack face for admitting a supply of fuel gas, porous sealing means at the outer margins of the first stack face and at the outer margins of the second stack face for sealing to the supply of oxidant gas and to the supply of fuel gas.« less
  • A method of maintaining molten salt concentration in a low temperature electrolytic cell used for production of aluminum from alumina dissolved in a molten salt electrolyte contained in a cell free of frozen crust wherein volatile material is vented from the cell and contacted and captured on alumina being added to the cell. The captured volatile material is returned with alumina to cell to maintain the concentration of the molten salt.
  • A fuel cell stack is disclosed with modified electrolyte matrices for limiting the electrolytic pumping and electrolyte migration along the stack external surfaces. Each of the matrices includes marginal portions at the stack face of substantially greater pore size than that of the central body of the matrix. Consequently, these marginal portions have insufficient electrolyte fill to support pumping or wicking of electrolyte from the center of the stack to the face surfaces in contact with the vertical seals. Various configurations of the marginal portions include a complete perimeter, opposite edge portions corresponding to the air plenums and tab sizemore » portions corresponding to the manifold seal locations. These margins will substantially limit the migration of electrolyte to and along the porous manifold seals during operation of the electrochemical cell stack.« less
  • A device for equalizing the molten electrolyte content throughout the height of a fuel cell stack is disclosed. The device includes a passageway for electrolyte return with electrolyte wettable wicking material in the opposite end portions of the passageway. One end portion is disposed near the upper, negative end of the stack where electrolyte flooding occurs. The second end portion is placed near the lower, positive end of the stack where electrolyte is depleted. Heating means are provided at the upper portion of the passageway to increase electrolyte vapor pressure in the upper wicking material. The vapor is condensed inmore » the lower passageway portion and conducted as molten electrolyte in the lower wick to the positive end face of the stack. An inlet is provided to inject a modifying gas into the passageway and thereby control the rate of electrolyte return.« less