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US4643235A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for making oxygen electrode for alkaline galvanic cells

Assignee: Accumulatorenwerk Hoppecke Carl Zoellner and Sohn KG
•
Filing: 1985-11-27
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Granted: 1987-02-17
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Expires: 2005-11-27
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Abstract

Abstract An oxygen electrode for alkaline galvanic cells. The electrode includes a talyst-containing carbon layer, a current collector, and a preferably foil-like separator for separating a liquid chamber from a gas chamber in such a way that the gas can pass to the carbon layer but the liquid cannot enter the gas chamber. The electrode has a structurally simple construction as a multi-layer, gas diffusion electrode, the current density of which, in the temperature range of between approximately 20° and 80° C., is approximately 350 mA/cm 2 during operation with air, and greater than 1 A/cm 2 during operation with oxygen. The current collector includes a metal grid which is at least partially embedded in a carbon layer. In the method of producing such an oxygen electrode, a catalyst salt solution is mixed with an aqueous activated carbon suspension and is deposited onto the activated carbon to form a catalyst dispersion. Subsequently, the liquid is separated off to form a catalyst composition, and the metal grid is embedded at least partially in this catalyst composition.

Inventors

  • 👤 Peter Schmoede
  • 👤 Detlef Katryniok, deceased
  • 👤 Jean P. Ruch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 19:45
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 108 words
A method of producing a single-layer oxygen electrode for alkaline galvanic cells and including a carbon layer having 30 to 40% by weight carbon, 15 to 30% by weight silver, 10 to 20% by weight palladium and 20 to 30% by weight binder, comprising the steps of: mixing a catalyst salt solution with a liquid to form an aqueous activated carbon suspension, for distribution thereof so that there is depositing of catalyst on said activated carbon to form a catalyst dispersion; separating off the liquid to form a catalyst composition; and at least partially embedding a metal grid in said catalyst composition to produce the single-layer oxygen electrode.
Claim 2
Independent Claim 108 words
A method of producing a single-layer oxygen electrode for alkaline galvanic cells and including a carbon layer having 30 to 40% by weight carbon, 15 to 30% by weight silver, 10 to 20% by weight palladium and 20 to 30% by weight binder, comprising the steps of: mixing a catalyst salt solution with a liquid to form an aqueous activated carbon suspension, for distribution thereof so that there is depositing of catalyst on said activated carbon to form a catalyst dispersion; separating off the liquid to form a catalyst composition; and at least partially embedding a metal grid in said catalyst composition to produce the single-layer oxygen electrode.
Claim 3
Dependent Claim 20 words
A method according to claim 1, which includes the step of roughening said metal grid prior to said embedding step.
Claim 4
Dependent Claim 19 words
A method according to claim 1, which includes the step of conducting said mixing step in an ultrasonic bath.
Claim 5
Dependent Claim 29 words
A method according to claim 1, in which said separating off step includes introducing said catalyst dispersion in a water-filled sedimentation tank, and sedimenting it on a paper fleece.
Claim 6
Dependent Claim 50 words
A method according to claim 4, which includes the steps of pasting said catalyst composition onto said fleece, rolling said composition under a pressing effect, pressing said grid onto or into said catalyst composition, removing said fleece, and drying said electrode at a temperature of between 150° and 200° C.

References Cited (Backward Citations)

US3600230A Cited
US4341848A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-02-16 1990-08-18 1991-02-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-02-16 1994-08-18 1995-02-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-02-16 1998-08-18 1999-02-17 $7700.00 Window Closed / Lapsed

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