Negative electrode for gastight alkaline storage batteries having a carbon-black-containing gas-consumption layer
AssigneeVarta Batterie Aktiengesellschaft
InventorChristoph Klaus
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Abstract
A carbon-black-containing gas-consuming layer on the surface of a negative electrode is produced from a mixture of an aqueous carbon black dispersion and an aqueous PTFE dispersion, both of which contain a surfactant of the same type (either cationic, anionic or nonionic) for the purpose of stabilization. The stabilized particles in the final gas-consuming dispersion are formed by coating PTFE particles with smaller carbon particles, preferably with an interlayer or envelope of a surfactant film. Pores and cracks operate to increase the effective catalytic surface area for oxygen gas. Additions of polyacrylic acid esters are suitable for adjusting the viscosity of the dispersion. The dispersion is applied to the electrode by immersion or spraying.
Claims16
A negative electrode for a gastight alkaline storage battery having a carbon-black-containing gas-consumption layer which comprises a carbon black component including a mixture of an aqueous carbon black dispersion with an aqueous PTFE dispersion, and a surfactant in both dispersions which is uniformly either cationic, anionic or nonionic in type.
Dependencies are inferred from the claim text.