Paste for negative plate of accumulators and its manufacturing process

摘要

679,096. Batteries. GENERAL MOTORS CORPORATION. May 31, 1951 [June 30, 1950], No. 12876/51. Class 53. An expander to be mixed with the paste of the negative plate of an accumulator consists of a mixture of a lignin-containing material, carbon black, an alkaline earth metal hydroxide, an alkali metal hydroxide, waste sulphite liquor and a small quantity of nickel sulphate. The lignin-containing material may consist of straw, peat moss, corncobs or sawdust. The expander is made by first heating the sawdust &c., and the hydroxides and carbon black with water for about four hours and then adding the waste sulphite liquor and continuing the heating for another hour. A solution of nickel sulphate is then added and the heating continued for about fifteen minutes, whereupon the mixture is dried and ground. Specification 598,138 is referred to.