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Zinc-halogen compound electrochemical cell having an auxiliary electrode and method
| Details |
Inventors: Kantner, Edward;
Assignee: Exxon Research & Engineering Co. (Linden, NJ)
Primary Examiner: LeFevour; Charles F.
Assistant Examiner:
Attorney, Agent or Firm: Glynn; Kenneth P.
An electrochemical cell is described which contains, in a sealed configuration, an anode having a zinc anode-active material, a cathode having a halogen compound cathode-active material, a liquid electrolyte having a gas space above it, and an auxiliary electrode. The auxiliary electrode is made of a carbon-containing hydrophobic material, is adapted to carry a cathodic potential, and is positioned in the cell so as to be partially located in the liquid electrolyte and partially located in the gas space. A method of retarding pressure build-up in the cell also is described. The method involves converting hydrogen gas which is generated in the cell and builds up in the gas space to its ionic state via the formation of an ionic compound and dissolving the compound in the liquid electrolyte by creating a cathodic potential at the auxiliary electrode. |
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DETAILED DESCRIPTION The present invention is directed to a sealed electrochemical cell which includes a zinc-containing anode, a halogen compound-containing cathode, a liquid electrolyte having a gas space above it, and an auxiliary electrode.
The auxiliary electrode is made of a carbon-containing hydrophobic material, is adapted to carry a cathodic potential, and is positioned in the cell so as to be partially located in the liquid electrolyte and partially located in the gas space.
The present invention is also directed to a method of retarding pressure build-up in sealed zinc-halogen compound cells.
The method involves converting hydrogen gas, which is generated in the cell and builds up in the gas space, to its ionic state via the formation of an ionic compound, e.
g.
, HCl or HBr, and dissolving it in the liquid electrolyte.
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