GB719013A - Improvements in electrodes for electric accumulators - Google Patents

Abstract

719,013. Batteries. BADISCHE ANILIN- & SODA-FABRIK.. Dec. 10, 1952, [Dec, 14, 1951.] No 31254/52. Class 53. Accumulator electrodes consist of porous bodies of non-metallic substances, for example carbon, ceramics, glass, plastics, the pores of which are lined with electrochemically resistant metals such as nickel and copper. Active materials such as the hydroxides of nickel and cadmium are deposited in the pores after these have been coated with the metal.. The metal may be deposited on the walls of the pores electrolytically or by chemical deposition and reduction or by thermal decomposition of metal chlorides, carbonyls, or other compounds. In one example the porous body is impregnated with copper nitrate and then treated with hydrogen at a high temperature. Alternatively the nitrate-impregnated body may first be treated with an alkali before the reducing process. In another example a current of carbon monoxide containing nickel carbonyl is drawn through a plate or porous glass heated to 300 ‹C. whereby the pores become coated with nickel. The glass is then impregnated with a solution of nickel nitrate which is converted into nickel hydroxide electrolytically. In a further example a porous magnesite plate is impregnated with nickel nitrate, then dipped in caustic potash and finally treated with hydrogen at 900 ‹C. to form a nickel coating on the pore walls of the plate. A negative electrode is formed by filling the pores with cadmium hydroxide.