化学共沉淀法制备铝掺杂α-Ni(OH)_2的控制条件

Control Condition of Al-substituted α-Ni(OH)_2 Prepared by Chemical Co-precipitating Method

采用化学共沉淀法制备掺杂Al的α—Ni（OH）2，用正交实验研究pH值、掺杂Al的含量、陈化时间、反应温度等制备因素对活性物质放电比容量的影响，并用极差法分析各制备因素影响的显著性。结果是，制作性能优良的掺杂Al的α—Ni（OH）2的最佳条件为：反应温度40～50℃，掺杂10％摩尔含量的Al，陈化12～16h，pH值7．5～9．5；各因素对活性物质放电比容量影响的显著性顺序为：掺杂Al的含量〉pH值〉反应温度〉陈化时间，在选择合成条件下制备的样品电极具有较好的充放电效率和活性物质利用率，电化学阻抗较小，最大放电比容量为345．2mAh·g^-1。

Al-substituted α—Ni（OH）2 by a chemical co-precipitation method were prepared, a groupof orthogonal test is arranged and carried out to study the effect of pH value,Al content,aged time, reaction temperature on the specific discharge capacity, and the range analysis is employed to distinguish the influent degree of factors included in this test. After analysis,it shows that the best technological conditions to make Al-substituted α—Ni（OH）2 with best performance is specified as reaction temperature 40-50 ℃ ,Al mole content 10% ,aged time 12-16h,pH value 7.5-9.5,and the relative influence degree of the technology factors is Al content 〉pH value 〉 reaction temperature 〉 aged time, the optimum conditions for obtaining the sample has a good chargedischarge efficiency, higher utilization of active material and smaller electrochemical impedance, maximum specific discharge capacity were 345.2 mAh · g^-1.