Electrochemical Performance of Ni(OH)2 Positive Materials

摘要:

采用化学共沉积方法制备了5种不同化学成分的氢氧化镍正极材料。用含有Co、Zn、Ca、Mg、Cu或者Mn元素的化合物与硫酸镍混合，在一定的搅拌速率、温度和pH值下使之相互发生反应。XRD衍射分析表明所制备材料的显微结构为β-Ni(OH)2。SEM图片显示氢氧化镍为球形颗粒，且颗粒表面略显粗糙。电化学测试结果表明氢氧化镍样品B在不同的充放电倍率和温度下具有优异的性能，25和65 ℃下、充放电倍率分别为1和3 C时氢氧化镍样品B的放电容量均超过了285 mAh·g-1。实验表明，通过化学共沉积其他元素可以制备性能优异的氢氧化镍正极材料，这将有益于改进镍氢电池的性能

Abstract:

Five kinds of Ni(OH)2 positive materials with different chemical compositions were prepared by a chemical coprecipitation method. The compounds with Co, Zn, Ca, Mg, Cu or Mn elements were mixed with nickel sulfate and reacted with each other at a special temperature and pH value under stirring. The XRD analysis indicates that the microstructure of as-prepared materials is β-Ni(OH)2. SEM images show the particles are spherical with a little rough surface. The electrochemical results indicate that the Ni(OH)2 B has the best performances at different rates and temperatures. The discharge capacities for Ni(OH)2 B sample can achieve more than 285 mAh·g-1 at 1 C/3 C rate both at 25 and 65 oC. The experiment shows that the Ni(OH)2 positive materials with perfect properties can be synthesized by coprecipitating other elements, which is helpful for the improvement of Ni-MH batteries