Coated iron electrode and method of making same
Provided is an iron based electrode comprising a single layer of a conductive substrate coated on at least one side with a coating comprising an iron active material and a binder. The iron based electrode is useful in a Ni—Fe battery as the anode. The electrode can also be prepared by continuously coating each side of the substrate with a coating mixture comprising the iron active material and binder.
1. A battery comprising a nickel based cathode and an iron anode, with the iron anode comprising a single layer of a conductive substrate coated on at least one side with a coating comprising an iron active material, polyvinyl alcohol and sulfur, wherein the iron active material comprises an Fe metal or iron oxide species, and the substrate is a metal foil, metal sheet, metal foam, metal mesh, woven metal, or expanded metal.
2. The battery of claim 1 , wherein the coating on at least one side comprises an antimony, selenium, and tellurium additive, or mixture thereof.
3. The battery of claim 1 , wherein the coating is on both sides of the substrate.
4. The battery of claim 1 , wherein the substrate is comprised of a nickel foam material.
5. The anode battery of claim 1 , wherein the coating comprises a pore former.
6. The battery of claim 1 , wherein the porosity of the iron anode is in the range of about 15-25%.