Electrochemical cell with a cadmium patch electrode

• US 4,185,144 A
• Filed: 09/05/1978
• Issued: 01/22/1980
• Est. Priority Date: 09/05/1978
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Bloom, Stanley M., Hoffman, Arnold, Norland, Kenneth, Ames, Allan E.
• Primary Examiner(s): LeFevour, Charles F.
• Application Number:
  US05/939,876
• Time in Patent Office: 504 Days
• Field of Search: 429/199, 429/222, 429/156, 429/162
• US Class Current: 429/156
• CPC Class Codes: H01M 4/12 of consumable metal or alloy electrodes use of alloy compositions as active materials H01M4/38
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 6/06 Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid

Abstract

A cadmium patch laminar electrode, comprising a dispersion of particulate cadmium in a binder matrix on a conductive plastic substrate is prepared by contacting a zinc patch electrode comprising a dispersion of particulate zinc in a binder matrix on a conductive plastic substrate with an aqueous solution of a cadmium salt. The cadmium patch electrode can be used in a primary electrochemical cell such as that employing a manganese dioxide cathode and a cadmium chloride electrolyte.

Claims

1. A primary electrochemical cell comprising an anode comprising cadmium, a cathode comprising manganese dioxide and an electrolyte consisting essentially of aqueous cadmium chloride wherein said anode is a cadmium dry patch anode and is prepared by contacting a zinc patch electrode which comprises a dispersion of particulate zinc in a binder matrix deposited on a conductive plastic substrate with an aqueous solution of cadmium salt for a time sufficient for the zinc and cadmium to undergo a mutual exchange reaction.

2. A primary battery comprising a plurality of primary electrochemical cells of claim 1.

3. A flat laminar primary battery in accordance with claim 2.

4. An electrical cell, comprising an anode consisting essentially of cadmium, a cathode of manganese dioxide and carbon, and an electrolyte consisting essentially of water, ammonium chloride and cadmium chloride.