| 摘要 |
1,156,945. Dry secondary cell. MALLORY BATTERIES Ltd. 14 Oct., 1966 [1 Dec., 1965], No. 45933/66. Heading H1B. A secondary cell according to the invention comprises an oxygen - containing cathode and an anode separated by a layer of clear, self - supporting, non - fibrous electrolyte gel, prepared from a fibrous cellulosic material and an alkali metal hydroxide at a temperature below -10‹ C. The cathode may comprise a support of sintered titanium or nickel powder or a porous carbon plaque the pores of which are lined with a pyrolytically formed layer of NiO, CoO or MnO 2 and another layer of the same oxide of electrolytic origin. The pyrolytic layer may be formed by vacuum impregnating the support with cobalt or nickel nitrate and heating this to 310-375‹ C. The electrolytic layer may be formed by electrolytic deposition of the metal hydroxide from a solution of the nitrate or chloride at 80-90‹ C., cathodic reduction in LiOH of any remaining nitrate to hydroxide and anodic oxidation of the hydroxide to the oxide. The anode may be Cd or Fe, a perforated zinc plate, a plaque of amalgamated zinc powder or zinc sprayed on to cloth or electrodeposited on a brass screen. The alkali metal hydroxide may be KOH, NaOH or LiOH and may contain some alkali metal zincali formed by addition of zinc oxide. The cellulosic material may be Dexter paper or Webril. In assembling the cell the cathode may be wrapped in cellulosic material and a U- shaped anode placed round it. The whole may then be impregnated with LiOH solution and maintained at -10 to -20‹ C. to allow the hydroxide-cellulose reaction to occur. The resulting unit may be placed in an open ended container of nylon and the top sealed with epoxy resin. In a particular embodiment cathode 10, fitted with terminal 12 is surrounded by electrolyte layer 14, anode 16 carrying terminal 18 and nylon case 20. The case is sealed with epoxy resin 22 but siliconized cotton twine 24 passes through the seal to provide a vent. |
