Abstract The invention relates to a process for the preparation of sponge cadmium electrode material which comprises the steps of compressing the mixture of cadmium oxide and a finely divided inert electronic conductor at a pressure between about 1 psi and 100 psi, and subsequently electrolytically reducing the cadmium oxide to metallic cadmium in an alkaline electrolyte. Preferably the cadmium oxide is used in the form of a powder having a particle size between about 50 microns and 150 microns while the electrolytic conductor is preferably finely divided nickel powder or a metal in filamentary form such as steel wool, nickel wool, or electrolytic copper wool and is furthermore preferably used in a proportion amounting to between 5 and 45 percent by weight of the total mixture. Particularly good results are obtained when the compressing pressure is between about 1 and 4 psi.
Inventors
👤 R Haines
👤 I Henderson
👤 F Sievenpiper
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-01 15:18
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
17 words
A process as claimed in claim 1 wherein said finely divided electronic conductor is finely powdered nickel.
Claim 2
Dependent Claim
43 words
A process as claimed in claim 2 in which said finely powdered nickel is a nickel powder having an apparent density less than 2 gm/cm3 and is present in an amount of between 10 and 25 percent by weight of the total mixture.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 3 wherein said nickel powder has an apparent density less than 1 gm/cm3.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 4 in which said cadmium oxide is a powder of particle size between about 50 microns and about 150 microns.
Claim 5
Dependent Claim
40 words
A process as claimed in claim 3 wherein the cadmium oxide is a powder of particle size between about 50 microns and 150 microns and wherein the electronic conductor is finely powdered nickel of apparent density less than 1 gm/cm3.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 1 wherein said pressure is between 1 and 4 psi.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 7 wherein said cadmium oxide is a powder of particle size less than 175 microns.
Claim 8
Dependent Claim
25 words
A process as claimed in claim 7 wherein said cadmium oxide is a powder of particle size between about 50 microns and about 150 microns.
Claim 9
Dependent Claim
19 words
A process as claimed in claim 1 wherein said finely divided electronic conductor is a metal in filamentary form.
Claim 10
Dependent Claim
22 words
A process as claimed in claim 10 wherein the metal in filamentary form is steel wool, nickel wool or electrolytic copper wool.
Claim 11
Dependent Claim
31 words
A process as claimed in claim 1 wherein after reduction of the cadmium oxide the material is subsequently cut or shaped to the configuration and size required of the final electrode.
Claim 12
Dependent Claim
32 words
A process as claimed in claim 1 wherein the mixture of cadmium oxide and electronic conductor is compressed to form an electrode of the configuration and size required of the final electrode.