Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/24—Electrodes for alkaline accumulators
  • H01M4/26—Processes of manufacture
  • H01M4/28—Precipitating active material on the carrier
  • H01M4/29—Precipitating active material on the carrier by electrochemical methods
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/26—Electroplating: Baths therefor from solutions of cadmium
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/12771—Transition metal-base component
  • Y10T428/12785—Group IIB metal-base component

Definitions

• a cadmium plate for an alkaline battery by depositing cadmium onto a grid electrolytically from a plating solution containing cadmium sulphate or some other suitable soluble cadmium salt, and then pressing the plate to the desired thickness.
• the plate should have maximum porosity, it is important that the structure of the deposited cadmium should be granular, and we have found that the deposited cadmium tends to become crystalline (i) if the current densities used in the process exceed 35 milliamps per sq. cm. and (ii) if the temperature of the solution exceeds 30 C.
• the invention resides in a method of forming a cadmium plate, characterized by the addition of arsenic.
• the arsenic is preferably added in the form of arsenous oxide, which preferably is present in proportions of at least 0.5 gram per litre.
• the invention further resides in a cadmium plate whenever formed by a method according to the invention, and in a plating solution for use in performing the method.
• a plating solution was made by dissolving 0.5 gram of arsenious oxide in boiling water, cooling the solution to room temperature, adding 50 grams of cadmium sulphate and then making up the solution to 1 litre with water.
• the solution was placed in a plating bath including an expanded silver mesh as the cathode and a sheet of cadmium as the anode.
• Cadmium was then deposited from the solution onto the cathode electrolytically.
• the process was carried out over a range of current densities from 15 to 150 m.a. per sq. cm., and in each case .a porous granular deposit was obtained. A satisfactory deposit was also obtained at current densities up to 300 milliamps per sq. cm., and the process was found to work satisfactorily with the temperature of the plating solution up to C. and its pH value between 3 and 5.
• the grid is removed from the plating solution, washed in water, pressed to the desired thickness and then dried in a vacuum oven to form the finished plate.
• the adhesion of the cadmium to.-the grid can be improved by depositing the cadmium from a solution of cadmium sulphate, arsenious oxide and either sodium sulphate or ammonium sulphate.
• a solution of cadmium sulphate, arsenious oxide and either sodium sulphate or ammonium sulphate In thecase of the solution containing sodium sulphate, the pH of the solution is preferably maintained in the range 3' to 6, but using the solution containing ammonium sulphate the upper limit can be raised to 7.5.
• Typical plating solutions for this purpose include in addition to water the following constituents in grams per litre:
• the grids are treated to form the plates as in the first example, except that where the solution contains ammonium sulphate, the plate is preferably immersed in 2% sulphuric acid before washing.
• a method as claimed in claim 2 in which arsenious oxide is present in proportions of at least 0.5 gram per liter.
• an aqueous electrolyte for the electrodeposition of cadmium upon a grid to form an electrode for use in an alkaline battery and wherein said electrolyte comprises a soluble cadmium salt
• said improvement consisting in said electrolyte having an amount of arsenic in solution sufiicient to provide a granular cadmium electrodeposit, and the pH of said electrolyte being between 3 and,7.5.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• General Chemical & Material Sciences (AREA)
• Battery Electrode And Active Subsutance (AREA)
• Secondary Cells (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10356573

Family Applications (1)

Country Status (3)

Cited By (5)

Families Citing this family (1)

Citations (2)

• 1965
  • 1965-08-06 GB GB33719/66A patent/GB1148306A/en not_active Expired
• 1966
  • 1966-07-27 DE DE19661596160 patent/DE1596160B2/de active Pending
  • 1966-07-28 US US568383A patent/US3449167A/en not_active Expired - Lifetime

Patent Citations (2)

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