Thin tubular positive electrodes for lead acid batteries and method of making same

Patent · Tue Aug 27 04:00:00 EDT 1985

OSTI ID:5831371

Sundberg, E G

Improved positive electrodes for lead-acid batteries are disclosed, in which the said electrodes are initially fabricated such that: the ratio between a calculated weight of formed, dry active material filled into a tube member and the weight of its corresponding lead spine is restricted to a maximum value of 1.5:1; the ratio between the lateral cross-sectional area enclosed by a tube member and the lateral cross-sectional area of its corresponding lead spine is restricted to a maximum value of 5:1; and the distance between the inner surface of a tube wall and the surface of its corresponding lead spine is restricted to a maximum value of 2.5 mm; for electrodes designed for use at the 5-hour discharge rate or greater, this distance is restricted to a maximum value of 1.8 mm. Thereafter the electrodes are subjected to a deliberate electro-chemically-induced corrosion of outer surface of the spines, to produce zones of high-density PbO/sub 2/ immediately surrounding and in intimate contact with the spines. These high-density zones inhibit further corrosion of the spines. In this manner thinner-than-conventional tubular positive electrodes may be provided having a cycle life characteristic at least as good as that of conventional electrodes, and battery cells utilizing a plurality of these electrodes will demonstrate a substantially improved energy density characteristic.

• Assignee: IFI; EDB-86-086968
• Patent Number(s): US 4537842
• OSTI ID: 5831371
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ANODES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
ELECTRIC BATTERIES
ELECTRIC DISCHARGES
ELECTROCHEMICAL CELLS
ELECTROCHEMICAL CORROSION
ELECTRODES
ENERGY DENSITY
FABRICATION
LEAD COMPOUNDS
LEAD OXIDES
LEAD-ACID BATTERIES
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
PRODUCTION
SERVICE LIFE
TIMING PROPERTIES
TUBES