电解法制备球形氢氧化镍工艺研究

提出一种制备电池用高密度球形氢氧化镍的一步电解法工艺。从电解液组成及电解过程操作程序两方面 ,研究了工艺参数对产品物理性能的影响。结果表明 ,以起始 pH为 8.0～ 1 0 .0、浓度为 2 .0～ 4.0mol/L的LiCl、NaCl、KCl水溶液或其混合物为电解液主要成分 ,在电解过程中保持NH3的添加量与电解电流比值 n(NH3,mol/h)∶I(A) ]为 0 .0 6～0 .0 8即保持n(NH3)∶n(Ni)为 3 .0～ 4.0 ]的条件下 ,经 40h以上的持续恒电流电解 ,可制得振实密度大于 2 .0 g/cm3、比表面积大于 1 5m2 /g、初始容量大于 2 2 0mAh/g的适合于碱性电池用的球形氢氧化镍。

Study on the technology of one-step electrolysis method for synthesizing spherical nickel hydroxide

A novel method, which was called as one-step electrolysis, for synthesizing spherical nickel hydroxide was proposed. The effect of the technical parameters on the property of the products was studied from the view of the composition of electrolyte and the practical electrolysis program. The results show that spherical nickel hydroxide can be produced in the case of the electrolyte containing LiCl, NaCl, KCl or their mixture with the concentration and the initial pH value in the range of 2.0-4.0 mol/L and 8.0-10.0 respectively. The spherical nickel hydroxide produced by this method with the tap density over 2.0 g/cm3, the specific surface area over 15 m2/g and the initial capacity over 220 mAh/g is suitable to be used as cathode material for alkaline battery.