Production of a porous aluminum matrix for the negative electrode of a galvanic lithium aluminum metal sulfide element
AssigneeBattelle-Institut e.V.
InventorsReinhard Knodler, Gotthold Bohme
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Abstract
Process for the production of a porous aluminum matrix for the negative electrode of a galvanic cell, in the charged state, having lithium aluminum and metal sulfide elements (or electrodes). Aluminum powder is thoroughly mixed, e.g., by grinding, with a fine salt, which is soluble in water and which serves as an expanding agent. Coarser particles of the same expanding agent (about 100 to 500 .mu.m in size) are then added. The matrix is finally completed by hot pressing at a temperature of 150.degree. to 300.degree. C. and a pressure of at least 500 bar and by the expanding agent being subsequently dissolved out of the matrix using water.
Claims7
Process for the production of a porous aluminum matrix for the negative electrode of a galvanic cell, in the unchanged state, having aluminum and metal lithium sulfide elements or electrodes, which comprises thoroughly mixing aluminum powder with a salt, which is soluble in water and which serves as an expanding agent, the grain size of the mixture of aluminum powder and fine expanding agent being less than or equal to 50 .mu.m, then adding coarser particles having a particle size of about 100 to 500 .mu.m of the expanding agent to the mixture of aluminum powder and fine salt, hot pressing the resultant mixture at a temperature of 150.degree. to 300.degree. C. and a pressure of at least 500 bar, an aluminum matrix forming, and dissolving the expanding agent out of the resultant aluminum matrix with water, whereby the porous aluminum matrix is formed.
Dependencies are inferred from the claim text.