Abstract: A method is disclosed for the manufacture of a highly porous nickel electrode body for electrical accumulators. The new electrode body is also disclosed. By using 5-7% by volume of a nickel powder in admixture with 93-95% by volume of a pore-forming agent selected from the group consisting of ammonium bicarbonate and ammonium carbonate when pressing and sintering the electrode body a very high porosity is obtained, such as 90-95%, in spite of which the mechanical strength of the body is so high as to resist the strains of an accumulator cell. Especially preferable to impart outstanding strength to the electrode body, is a pressure of at least 100 MPa in the pressing operation.

Abstract: A separator is disclosed for a flat, substantially vertical electrode plate in an electric accumulator. An electrode array is also disclosed which consists of alternatingly placed positive and negative, flat, substantially vertically arranged electrode plates, and said separators. The separator is of the type which comprises two substantially vertical, U-shaped edge insulating members. According to the invention these are kept together by a bottom strip and two parallel top strips, all strips being substantially horizontal, and at least one vertical insulating rod between each top strip and the bottom strip, a space for the electrode plate being formed within said separator.

Abstract: The invention relates to a porous body for electrical accumulators which body shows a new structure comprising at least two cohesive layers, at least one of which is a porous layer of sintered metal powder and at least one a thinner layer of solid metal produced by fusion and solidification of one of the external surfaces of the adjacent porous layer. The invention also relates to a method of manufacturing such an electrode body as well as to an electrical accumulator containing at least one such electrode body.

Abstract: The invention relates to a new method of manufacturing a nickel hydroxide electrode wherein the electrochemically active nickel hydroxide is formed in the pores of a nickel structure by reacting the nickel of said structure with a gas which forms a salt therewith in situ capable of reacting with an alkali metal hydroxide to form nickel hydroxide.The invention also relates to the prepared electrode and to an alkaline storage battery containing the same as well as to the use of said electrode in an alkaline storage battery.

Abstract: A method for the selective recovery of cadmium, nickel and cobalt from a nickel-cadmium battery waste which comprises:A. leaching the waste with an ammoniacal carbonate solution to form an aqueous ammoniacal carbonate solution containing cadmium, nickel and cobalt (II) ammine complexes and a leaching residue. Any iron in the waste is in the leaching residue.B. adding air to the aqueous ammoniacal carbonate solution to oxidize the cobalt (II) ammine complex to cobalt (III) ammine complex.C. contacting the resulting aqueous ammoniacal carbonate solution with a substantially water insoluble organic solution which contains a hydroxyoxime which forms a nickel compound readily soluble in the organic solution with any nickel present but which does not affect cadmium and cobalt (III). Nickel is thereby removed.D. precipitating the cadmium as a carbonate by removing ammonia from the aqueous ammoniacal carbonate solution and then removing the cadmium in the form of a carbonate.E.