Method for producing zinc anode

• US 4,001,467 A
• Filed: 02/24/1975
• Issued: 01/04/1977
• Est. Priority Date: 10/23/1973
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Sullivan, Charles I.
• Primary Examiner(s): Kendall, Ralph S.
• Application Number:
  US05/552,709
• Time in Patent Office: 680 Days
• Field of Search: 136/127, 136/125, 136/126, 136/30, 136/31, 136/75, 136/120 R, 260/42.22, 260/29.6 ME, 427/123
• US Class Current: 427/123
• CPC Class Codes: H01M 4/06 Electrodes for primary cells
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: H01M 6/48 with bipolar electrodes

Abstract

A flat zinc anode useful in cells and batteries, e.g., Leclanche batteries, is produced by coating an electrically conductive substrate with a slurry of zinc dust and an aqueous polymer latex in which the polymer particles have been swollen by an alcohol. The amount of the polymer is about 0.5 to 5 weight percent based on the amount of zinc. The amount of polymeric binder is not sufficient to form a continuous film but rather forms an adhesive mass which holds the zinc dust particles in place. Many polymers are suitable for use as binders, and it is presently preferred to employ, e.g., soft vinyl polymers, acrylates, or elastomers which do not react with zinc to impair battery performance or stability of the mix.

Claims

1. A method for producing an anode assembly which comprises the steps of swelling an aqueous polymer latex with a solvent miscible with water, mixing the swollen latex polymer particles with zinc dust, coating an electrically conductive resin substrate with the thus-formed suspension of zinc dust in an aqueous latex of swollen particles of a binder polymer, the amount of the binder polymer being about 0.5 to 5 weight percent based on the weight of the zinc, and drying the coating to form an adherent zinc coating on the substrate.

3. A method as defined in claim 1 wherein said suspension contains about 50 to 90 weight percent of solids.

4. A method according to claim 1 which includes the addition of a thickening agent to said latex subsequent to addition of the swelling agent but prior to coating said substrate.

2. A method as defined in claim 2 wherein said polymer is a copolymer of ethyl acrylate and 2-sulfo ethyl methacrylate.