Zinc anode and composition and method for producing same

• US 3,954,506 A
• Filed: 10/23/1973
• Issued: 05/04/1976
• Est. Priority Date: 11/16/1971
• 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): Skapars, Anthony
• Application Number:
  US05/408,925
• Time in Patent Office: 924 Days
• Field of Search: 136/125-127, 136/30-31, 136/111, 136/75, 136/67, 136/120 R, 136/120 FC
• US Class Current: 429/217
• 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 per cent 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 thin flat anode assembly comprising an electrically conductive organic resin substrate, and a coating on said substrate comprising zinc dust adhered by dried polymer particles formed from solvent swollen aqueous latex particles of a compatible organic polymeric binder, said polymer binder being present at a level of about 0.5 to 5 weight percent based on the weight of zinc dust.

2. An anode assembly according to claim 1 wherein said polymer binder is a copolymer of ethyl acrylate and 2-sulfoethyl acrylate.