Method for reducing zinc oxide content of zinc particles

• US 4,006,036 A
• Filed: 12/26/1974
• Issued: 02/01/1977
• Est. Priority Date: 12/26/1974
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Charkoudian, John C.
• Primary Examiner(s): Mack, John H.
• Assistant Examiner(s): LeFevour, C. F.
• Application Number:
  US05/536,433
• Time in Patent Office: 768 Days
• Field of Search: 136/31, 136/30, 136/126, 423/109, 75/101 BE, 75/.5, 75/120, 134/25 R, 134/26, 134/28
• US Class Current: 427/123
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Zinc particles to be employed in the manufacture of zinc anodes for batteries are treated to decrease the zinc oxide content.

Claims

1. The method for producing an anode assembly which comprises the steps, in sequence, of treating zinc particles with a solution of a zinc sequestering agent at a pH of about 7, washing the thus-treated zinc particles, mixing the zinc particles with a polymeric binder material, coating an electrically conductive substrate with the mixture, and drying the coating to form an adherent zinc coating on said substrate.

2. The method as defined in claim 1 which further includes the step of contacting said treated zinc particles with a surface passivating agent.

3. The method as defined in claim 1 wherein said sequestering agent is the disodium salt of ethylene diamine tetraacetic acid.

4. The method as defined in claim 1 wherein said zinc particles have a zinc oxide content prior to treatment is at least 3%.

5. The method as defined in claim 1 wherein the zinc oxide content subsequent to treatment is less than 3%.

6. The method as defined in claim 2 wherein said passivating agent is a quaternary ammonium compound.

7. The method as defined in claim 6 wherein said quaternary ammonium compound is benzyl-α

-picolinium chloride.

8. The method as defined in claim 4 wherein the zinc oxide content prior to treatment is at least 5%.