| 摘要 |
725,661. Batteries. BRITISH ELECTRICAL & ALLIED INDUSTRIES RESEARCH ASSOCIATION. Jan. 1, 1954 [Jan. 16, 1953], No. 1365/53. Class 53. [Also in Group XXII] Porous nickel electrodes for primary cells are protected against corrosion by coating them with nickel oxide containing lithium. The electrodes of the cell described in Specification 667,298 may be so treated and in one method of making such electrodes coarse nickel powder is placed in a mould and sintered at 1350‹ C. in hydrogen or a mixture of hydrogen and nitrogen. The sintered metal is then covered by spraying with a suspension of fine nickel powder in water, alcohol, acetone, benzene, ether or other liquid. Nickel powder may be rubbed on to this layer to seal any leaks. The electrode is again sintered at 1000‹ C. and finally immersed in a solution of lithium hydroxide, carbonate or other compound of lithium, dried, and oxidized by heating in air or a mixture of steam and air. In another method the large pore side of the electrode is made from finely powdered nickel mixed with ammonium carbonate, the mixture being compressed and sintered at 1150‹ C. The fine pore layer of nickel is sprayed on and the electrode dipped in a solution of nickel hydroxide, dried, and oxidized as in the previous example. Other examples are given in the Specification using nickel powders of various grades. |
