Lithium peroxide primary element

• US 4,504,561 A
• Filed: 07/18/1980
• Issued: 03/12/1985
• Est. Priority Date: 07/25/1979
• Status: Expired due to Term

• Current Assignee: Varta Batterie AG (Michael Tojner, PhD, LLD)
• Original Assignee: Varta Batterie AG (Michael Tojner, PhD, LLD)
• Inventors: Winsel, August
• Primary Examiner(s): Walton, Donald L.
• Application Number:
  US06/169,953
• Time in Patent Office: 1,698 Days
• Field of Search: 429/12, 429/13, 429/27, 429/29, 429/101, 429/105, 429/218, 429/122, 429/118
• US Class Current: 429/101
• CPC Class Codes: H01M 12/04 composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type
• CPC Class Codes: H01M 6/04 Cells with aqueous electrolyte

Abstract

In a galvanic primary element of the system Li/H₂ O₂, the aqueous cathode depolarizer H₂ O₂ is fixated as a polyurethane gel. It can thereby be controlled and caused to react with the anode metal in accordance with the current drain requirements. This is accomplished using a ram to press the gel toward a conductor which covers the lithium anode, which may take the form of a metal grid and/or a gas diffusion electrode. The oxygen which forms in the working layer through catalytic decomposition of hydrogen peroxide creates a gas bubble when the current is interrupted or the ram is stopped, thereby interrupting the further supply of hydrogen peroxide to the catalyst.

Claims

1. A galvanic primary element having a negative light metal electrode and hydrogen peroxide as the cathode depolarizer, wherein

the hydrogen peroxide is fixated in a gel formed with polyurethane or with branched polyacrylic acid,

the hydrogen peroxide-containing gel is positioned adjacent an electrical conductor which covers the surface of the light metal electrode and

means are provided within the cell for pressing the gel against the conductor.

2. The element of claim 1 wherein the gel is formed with polyurethane.

3. The element of claim 1 wherein

the electrical conductor is a coarse meshed metal grid and/or a gas diffusion electrode.

4. The element of claim 1 wherein

the light metal electrode is a lithium electrode.

5. The element of claim 1 wherein

the polyurethane gel is fixated in hydrogen peroxide as a 3-15% aqueous solution, and preferably 5-10%.