Penox Gmbh

Evonik Operations Gmbh

Penarroya Oxide Gmbh

Ian Klein

Werner Nitsche

Daniel Esken

Rainer Bussar

Micha Kirchgessner

Michael Glagla

Core-shell particles may be based on red lead coated with pyrogenically produced titanium dioxide and/or a pyrogenically produced aluminum oxide, and a process may prepare such core-shell particles which may be used in lead-acid batteries. The red lead may include PbOin a range of from 25 to 32 wt. %.

Core-shell particles based on red lead for lead-acid batteries

An additive for producing positive active compositions for lead accumulators based on finely divided 4-basic lead sulphate having an average particle size of less than about 3 &#x3bc;m and also finely divided silica, where the additive additionally contains red lead (2PbO.PbO), is described. The finely divided silica prevents, in particular, agglomeration of the particles of the 4-basic lead sulphate, while the red lead leads to an optimized distribution of all constituents of the additive in the battery paste. The use of red lead also gives a cost advantage. Despite the replacement of part of the 4-basic lead sulphate by red lead, the properties achieved in the later use in battery operation are no worse. Thus, the batteries display, for example, improved charging behavior and a higher high-current discharging stability. The invention further relates to the use of the additive according to at least one of claimstofor producing positive active pastes for lead accumulators, in particular for lead accumulators having a high total discharging stability.

Additive for producing positive active compositions for lead accumulators

Described is an additive for producing the positive active material for lead-acid storage batteries on the basis of finely divided tetrabasic lead sulfate. The additive contains a tetrabasic lead sulfate of an average particle size smaller than about 3 &#x3bc;m as well as finely divided silicic acid for preventing an agglomeration of the particles of the tetrabasic lead sulfate. During maturation, this additive ensures the formation of the structure of a tetrabasic lead sulfate crystal with a very narrow bandwidth of crystal sizes and a very homogeneous distribution. In a subsequent electrochemical formation to lead oxide, this leads to particularly efficient lead-acid storage batteries. Furthermore, the invention relates to a method of making the additive according to the invention as well as its advantageous use in the positive material for the maturation and drying of singled and not singled plates in the production of lead-acid storage batteries.

Additive for producing the positive active material for lead-acid storage batteries, a method for its production, and its use

The present invention is an additive for producing a positive active material for lead-acid storage batteries on the basis of finely divided tetrabasic lead sulfate. The additive contains a tetrabasic lead sulfate of an average particle size less than about 3 &#x3bc;m as well as finely divided hydrophobic silicic acid for preventing agglomeration of the particles of the tetrabasic lead sulfate. During maturation, this additive ensures the formation of the structure of a tetrabasic lead sulfate crystal with a very narrow bandwidth of crystal sizes and a very homogeneous distribution. In the subsequent electrochemical formation to lead oxide, this leads to particularly efficient lead-acid storage batteries. Furthermore, the invention relates to a method of making the additive according to the invention as well as its advantageous use in the positive material for the maturation and drying of plates in the production of lead-acid storage batteries.

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Bad Harzburg, Germany

Ian Klein