纳米Ni(OH)_2的控制结晶法制备

Preparation of Nano-scale Ni(OH)_2 Based on Controlled Crystallization

纳米Ni(OH)2可以有效地提升镍氢电池的性能.本文以NiSO4和NaOH为原料,聚乙二醇为分散剂,采用控制结晶法制备了纳米Ni(OH)2的胶体溶液,控制结晶的pH值和温度分别为11.0和45℃.然后用正丁醇进行共沸蒸馏处理.制备了分散性良好的纳米Ni(OH)2粉体,粉体颗粒粒径20nm左右,团聚体系数为1.07.并用TEM和XRD对粉体进行了表征.所制备的样品在1C倍率放电时电容量达到258mAh·g-1。.

The dispersive nano-scale Ni（OH）2 was synthesized by a improved controlled crystallization process and dehydrated by azeotropic distillation with n-butanol. The pH value and temperature of controlled crystallization were optimized to be 11.0 and 45℃, respectively. Asprepared nano-scale Ni（OH）2 was dispersive, of 20nm size, and characterized by both TEM and XRD analysis. It had discharge capacity in excess of 258mAh·g^-1.