| 摘要 |
390,192. Accumulators. ALMEIDA, E., Grand Buildings, Trafalgar Square, London, and DU CROS, SIR A., Craigweil House, Bognor Regis, Sussex. July 28, 1931, No. 21580. [Class 53.] In a secondary cell, the negative electrode comprises a metal or a low oxide thereof, the positive electrode comprises a higher oxide of the metal, the said oxides being insoluble and practically stable in the electrolyte which latter is a solution, of a salt of the same metal and is " fresh," i.e. has not been used in the preliminary charging of the battery. Suitable oxides and salts are those of manganese, nickel, cobalt, or lead. The electrolyte may include a soluble salt of any metal having a higher reaction energy.. If the negative electrode is made of a metal attacked by water, it may be coated with the lowest insoluble oxide of the metal, or the oxide may be supported on some other metal, preferably of but slightly lower reaction energy ; the higher oxide forming the positive electrode may be supported on graphite or on a metal forming an insoluble salt with the electrolyte. Thus a suitable cell is one having as positive electrode manganese dioxide supported by an inert but conductive material, as negative electrode, manganese monoxide on zinc, and as electrolyte a solution of manganese nitrate, chloride, or sulphate. |
